Was the motivation aspect of Eren always doomed to go to shit because he did what he did for a girl, even if you get rid of the paths and the pigs and the mind control just so you could have it be “eliminate Titans to live a peaceful life”? Especially since at least Chapter 50 Mikasa made so many signals that she’s be down for some “I’m not sure how long we got, so let’s have some ‘this could be our last time together, so let’s spend this one night right here in this moment at this place on this planet’” sex.
The problem was there was some sort of idea for Eren's motivation, because way back when he was mind-fucking Grisha he talked about the future and said he saw something 'beautiful' when he was interacting with Zeke. Its always alluded that there is some big reason as to why Eren is doing the things that he's doing. Which by their very nature, even in regards to the scenario, are extreme. But we're never given anything more.
The motivation aspect was doomed to go to shit, because like with Historia, Isayama waited until the very absolute last second to produce something, ANYTHING for Eren's reasons as to what he'd done. But there's really just...nothing. And that's the problem and which is why its shit writing. There's nothing explicitly there as to why genocide, the most extreme solution, is taken at face value. Isayama is full of shit when he's 'shocked' that people thought he wasn't writing a black and white story. He knew what he was doing, whatever he had planned, its obvious he pussied out.
So you have all this foreshadowing, all of these clues. Eren isn't crazy, he knows genocide is wrong. But he doesn't explain WHY he's doing the most extreme solution and not looking for other ways. We NEVER see what he sees. Its always teased, but then it just never pays off.
So in a way, it was always doomed. Because we were never spoon-fed any information. We don't even get anything but hints. The shitty 'Lelouch Imma be a villainy to be a hero' is a last minute excuse which is NEVER hinted at. Not to mention the plan itself is fucking retarded with so many unknowns. What happened if everyone was just on board with your global genocide? What happens if it fucks up and instead unites a continent against you for all time? What happens if the rumbling, by destroying all those walls, murders a ton of paradis civilians and fucks the island over completely? Why is an incredibly risky gamble where so much of it is out of your hands the ONLY thing that works? So no shit people are going to overlook this trash motivation which was never hinted at, revealed in two panels in a 139+ chapter manga at hundreds upon hundreds of pages and are going to go with virgin with rage because that's the only thing that remotely makes any sense and is supported by previous reveals.
It sort of reminds me of Invincible with Omni-Man where
you're hoping against hope that after he murders those heroes he has a good reason to do so. And it turns out....nope, he really did not. The problem was this was foreshadowed, directly SHOWN to us and made completely unambiguous. Its like the old-school show. 'The Shield' where the main character murders a cop in cold blood in the first episode. We're privy to this information. But here, we get no information. So the 'reveal', which is basically copied from another series, makes no sense in this one, and is a hated ending trope, is used extremely lazily.
These gambits rely exclusively on the behavior of other people when you're dead, which is why they're so fucking retarded. Literally anything would be better, because you have 0 control over the outcome. The Lelouch bullshit only works if you fake your death to make sure things work out in your favor, but the problem with this is, you're basically just a villain at that point, which is ok. But nobody really has the balls to do that.
Eren does his whole faggot "No one would forgive me so I may as well just fucking die" routine. And this in a manga where Jean forgives Reiner for destroying the gate and murdering hundreds upon thousands of his people, and sentencing others to starve to death. Not to mention it isn't like Mikasa wouldn't want to ride that D.
Then about the founder Ymir. The whole thing is so fucking stupid even after all this time. Its just hilariously bad.
My pitch for the basement reveal? Yes, there’s people outside the walls. Yes, there’s a Kingdom of Marley... that existed like hundreds of years ago, until it was stomped into the ground by the Titans, along with the rest of the world who didn’t have magic titan walls to protect them. Paradis literally IS the last bastion of humanity, and now the remnants of civilization outside the walls are trying to destroy it, either out of vengeance or out of the misguided hope that once Paradis falls, the titan menace will end.
The racism shit? That happened far, far in the past. The other nations of the world were afraid of the Eldians due to their titan powers, so they were slaughtered and rounded up for containment on Paradis. However, their king (or more likely, the new inheritor of the Founding Titan after their king was executed) retaliates by unleashing the titan menace on the world and walling up Paradis. Over the centuries, the history has been lost or covered up, and soon all anyone knows is life with the Titans.
After finding out about the world outside the walls, Eren would still be motivated by revenge on the Marleyan remnant. After all, far in the past, the other nations were the aggressors - and now they’re attacking yet again, and Eren’s mom died because of it. However, his methods would become more and more extreme, and our inability to really understand his motivations would be the POINT: he’s literally not making sense anymore because he’s blinded by rage and vengeance.
After an incident where he slaughters some of his friends for getting in the way of his plans for genocide, he finally gets a better perspective on what he’s been doing, and chooses to sacrifice himself to take out all the Titans. You can tie Ymir into all of this somehow to explain HOW this happens. The specifics aren’t that important, the main point is that Eren does something unforgivable that pushes him over the edge to seeing that violence only begets more violence, and that at his current trajectory the only possible ending is with EVERYONE dead.
Now, the story would end with the Titans gone for good and the rest of the world in a better place than before, which actually paves the way for a potentially upbeat resolution.
There’s still plenty of holes in this because I haven’t thought it through completely, but it at least justifies the rest of the world’s hatred toward Paradis as the source of the ongoing apocalypse, and creates an end state that is actually ambiguous yet hopeful, with the titan menace gone and everyone willing to start looking past their prejudice and disagreement to rebuild the world together.
Better than what we got.