What about detective Conan?
Jokes aside, in terms of comics, you could have long lasting characters and stories that spam decades and still be top sellers.
This book for example, is about to sell 5 million copies:
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And it ain't just Asterix from the bande dessiné that is still going strong, characters like Lucky Luke and Spirou are still being published in big numbers, and they don't have hollywood to keep them relevant. Spirou, BTW, is as old as Superman.
There is a crucial difference though, continuity. While there are introduced and recurring characters in Asterix, each of the books are very self-contained, you start at the Gaul village, you get an Asterix Adventure, and you end with a fest in the Gaul village, and that has been going for over 60 years.
And that is the thing about capeshit, their biggest quality is the very same thing that made them lose readers, the on goign universe continuity. Say what you will about marvel and DC, nothing comes close tho those two in terms of scope of characters and intertwined stories that spam over decades, but those come with a price, convoluted stories and diminishing returns in terms of stakes and drama.
Right now there are talks about Marvel killing off Peter Parker, and people can't even bother to even roll their eyes anymore. The problem with ever scalating, universe ending, character dieing-ressurecting plots is that, you run out of steam and right now Marvel and DC have a serious problem that their characters have been dulled out because of age and the attrition that comes from never ending but ever escalating stories.
In simple terms, you never gonna see Asterix and Obelix saving France from the blue laser from the sky, neither you gonna see one of them die, each of the Asterix book, like I said, is just the two of them going in a Adventure, but the strenght of these books lies in the charm of the characters, not the escalating "drama", deaths and ressurections, marriages and such.
Now, to be fair, DC is aware of this problem, and does release books of their characters just going on superhero adventuires, like "Superman man of tomorrow", and they are fun books, but nobody knows about it because it has been burried over a dozen of other Superman titles that also came out at the same time.
And that is the other strength that Bande Dessiné and mangas have over capeshit, concise titles. there aren't Asterix spin off like "Obelix and friends", and in manga it is very rare to see that either, just for mega super popular titles, and even then, it is always clear which is the main series. Capeshit you can't tell what the fuck is going on anymore, more so with marvel spamming event comics left and right.
But the biggest conundrum that capeshit comic is the following: they want to craft big stories about heroes going on these transformational growing journeys and saving the world from catastrophe... but they can't afford to change their big iconic characters so they can still keep selling t-shirts, that is why no one stays fucking dead on capeshit and Peter Parker is STILL learning the powers and responsability lesson.
And this shit is starting to rear it's head on the MCU, Vision just came back, seems like Steve Rogers is also coming back and when Iron hear rolls out, I doubt Disney won't pay RDJ his weight in gold so just he can record some voices for the Stark AI Riri uses. But once it gets stablished that death doesn't matter, soon nothing else will matter, drama will become muddled and soon apathia will settle in, just as it is in the comics right now.
People will still buy the captain America shield t-shirt, but the stories and characters in comics and movies will be met with indifference, because the attriction of wanting the big drama, but being unable to act change upon it will just dull the audience and in the there will only be a unimpassioned and unremarkable product, like the capeshit comics are right now.