Avengers: Endgame isn't quite the end of MCU Phase 3, as we initially thought, but it does seem to mark the endgames for some original stars and their characters. Chris Hemsworth may be on that boat, although he has said he'd be happy to return as Thor whenever they need him. If Valkyrie is in Endgame, she'd probably connect with Thor at some point. If the rest of the Asgardians return as well, will Thor want to leave to help start a new life with them, after they do whatever they do with Thanos? I have been avoiding any spoilers, so all speculation is valid to me.