If there is a Thor 4, I would guess it would be farther down the road; and, most likely launch a second trilogy. I would imagine there would have to be a fresh story and a different direction to go in. I'm kinda surprised that Asgard was trashed, along with most of the Asgardians - but then, Endgame could undo all of that...? Until then, Hemsworth might "guest-star" in other films.
Here's a question. The original Superman vs. Spider-Man has just come out, featuring Luthor and Doc Ock. So has Batman vs. The Incredible Hulk and that trippy team-up with The Joker and the Shaper of Worlds (Seriously? A whole rogues gallery and THAT's what they come up with?) Now, for the question: You get to decide the Wonder Woman inter-company crossover. DC and Marvel. You're following up on the first two. Who does she team-up with? Who is/are the villain(s). There's that blog that has featured Wonder Woman and Captain America as both partners and companions, with Rogers as a rival for Trevor. Would you go with that, or in a different direction?