(1.) Steven Yeun still have met the same fate in the show?
(2.) How much would it have positively and/or negatively affected the character in the show?
SURE, he worked for the Governor and all, but he BARELY shared any of the same barbaric ideologies that Phillip had. He wasn't any Simon to Philip's Negan, but rather, just a Eugene who wanted to do scientific studies on the dead. His own fate only sealed ITSELF as the Governor kept on pushing the boundaries between Woodbury and The Prison. At the end of the day, he was just a man who was working under the right position, but for the wrong person.
By the point of the second half of the entire show, Walter's success stops stemming from the fact that he's cooking meth to provide money for his family and he starts doing it for his OWN thrive. The ending of Granite State starts showing Walter try one last time to provide money for his FAMILY, only to fail when his son tells him to just "die" instead. It's not until Walter sees Gretchen and Elliot slandering him on TV where he's motivated to pursue a different plan that actually works (as shown in Felina) only because he's doing it for HIMSELF out of his OWN ego instead.
Back in Avengers: Infinity War, Tony Stark's first scene was him jogging through the park with Pepper Potts where he brings up the idea of having a daughter with her in the future named "Morgan" (named after her uncle) from a dream that he had where they LATER bring her to fruition in Avengers: Endgame.
A few years into the future of Doctor Strange in the Multiverse of Madness, it's established through knowledge of America Chavez that any dreams people have are actually perspectives of their variants in DIFFERENT universes.
SO, what if in Avengers: Secret Wars, the Morgan Stark that Tony mentioned back in Endgame shows up in Battleworld as some kind of heroic version of an "Iron Woman" or someone else?
Because other than sharing fictional stories, hypotheticals, or real-world FACTS, *THIS* video is never left with a definitive answer.
If you wanna sell more stories, just create some tie-in comics. LET the franchise rest, man.