I like the theories shared here so far.
However, I do think that
Spoilers
Loki might come back, because due to Ragnarok and the character’s success in it, they might decide to resurrect him for (if they end up doing) Thor 4. I hope Vision and Gamora are gone for good though. But most theories here regarding them sound much more convincing than actual death for the characters.
spills
I mean I could see why they might want to bring back Loki, but I think at this point, after Ragnarok, his story is well and truly done. As for my Gamora theory, I’m just guessing based on the fact that she specifically seems gone too soon. I don’t really know anything about the soul stone so I don’t really know if that’s possible. My thought was her life was literally traded for the stone, maybe there’s a way to reverse that trade.