One What If? Scenario For Each Marvel Film
2. Avengers: Endgame
What If The Other Heroes Survived The Snap?
The big one. There doesn't seem to be any other choice than what if the other heroes survived? Would the combined might of Spider-Man, Dr.Strange, Black Panther and the rest of the remaining Avengers be enough to reverse the affect of the snap? Would they go about it in the same method, or would they have an alternative approach?
This would be quite a big bit of fan service but to be fair it would be really interesting to see as well. Maybe they're doomed to fail no matter what and Doctor Strange always knows this, seeing as he has looked into multiple futures. Either way the snap just seems perfectly set up to explore the alternative timeline, fitting into the idea of Marvel's What If? extremely well.
However there is always the chance that Marvel decide to use a what if scenario surrounding Endgame to explore the character of Thanos further, which would be sure to also go down really well with fans.