Slightly offtopic from the thrilling subject of IRL actor shipping, but one of the most fucktarded decisions in the episode may well have just spoiled some real deep shit in the final book
Euron's end role being "Jamies ultimate nemesis" is so fucking random and out of nowhere I am willing to bet it was infact one of the big "endgame plot points" GRRM gave Dumb and Dumber alongside "the undead are defeated at winterfell" and "dany burns down kings landing in a fit of madness" and "cersei wildfire bombs the sept" and other such points.
With that in mind,
lets revisit just how scary and how much a threat Book Euron is
In the books he is not only depicted as a Ramsay Bolton tier sadist and monster but with far more intelligence and competence to the point of having a plan and the means to enslave Danys dragons for himself, and he is increasingly hinted and then flat out shown in the latest excerpts from
Winds of Winter to be deeply involved with the darker eldritch and lovecraftian shit that riddles the background lore and is steadily becoming more prominent in series, and he is actively planning something that involves mass slaughter-sacrificing a fucktunne of priests and magic users including nyarlathotep cultists and warlocks and such in order to become a god.
Take this quote from the latest snippet for example
"He showed the world his blood eye now, dark and terrible. Clad head to heel in scale as dark as onyx, he sat upon a mound of blackened skulls as dwarfs capered round his feet and a forest burned behind him. “The bleeding star bespoke the end,” he said to Aeron. “These are the last days, when the world shall be broken and remade. A new god shall be born from the graves and charnel pits.” Then Euron lifted a great horn to his lips and blew, and dragons and krakens and sphinxes came at his command and bowed before him. “Kneel, brother,” the Crow’s Eye commanded. “I am your king, I am your god. Worship me, and I will raise you up to be my priest.”"
All in all pretty spoopy stuff. Indeed as I mentioned before, this Euron is prime material for the ultimate villain beyond even the White Walkers given how he is set to become an invincible lovecraftian god-king. I imagine after betraying Cersei he will take over Kings Landing, kill at least one of Dany's dragons and enslave the other two with his dragon horn, and be all set to begin his genocidal conquest of the world, with the only thing standing in his way in this final hour being Jamie Lannister.
Should Jamie be the one to kill this level of monster at the cost of his own life, that would indeed be a worthy end for his character arc and the ultimate twist on his title "Kingslayer", perhaps he can die in Cersei's arms before whatever the Valonquer is comes to kill her. Either way he comes full circle and his character growth is done justice.
But the ultimate reason I now firmly believe something like this will happen?
GRRM has already penned a story where Jamie Lannister defeats Cthulhu* which by itself is a mildly amusing author penned fanfic, but combined with shit about euron we are finding out in the books and the confirmation in the show that Jamie kills him it makes this shit a near certainty.
So yeah, if Im right fans of Jamie can take solace in the fact he will be given a proper end in the books
* on a technicality by slaughtering his cultists before they can summon him, causing Cthulhu to forfeit