They just refurbished Star Tours 2 in 2011, so it would seem odd if they closed it so soon. I think it's close enough to Galaxy's Edge and it's on your way there, so I don't think most people will really care. Personally, I hope it stays around for a while if they don't have anything else to replace it with quickly. It's also a pretty high capacity ride, so having something to help with the crowds when the new lands open will be really important. The Jedi Training is also really popular, so I think that's going to stay. Personally, I like the ride and I hope it sticks around for a little while. (Maybe my dream of Body Wars 2 will come true sometime in the future. Probably not, but it's fun to dream.)
Indiana Jones is also pretty popular and it eats up the crowds pretty well. When I was there in January it was standing room only for my show, so I don't see that going away anytime soon.
Animation Courtyard needs help. It's getting an updated Disney Jr show this year and Star Wars Launch Bay will become unnecessary once Star Wars Land officially launches next year. Something else should go there that's animation themed for the kiddos. The Voyage of the Little Mermaid could use updating with some new puppets, digital projectors and source material which could be done fairly quickly. The Mickie Ride is also coming next year, so that will help that area of the park too.
Pixar Place is closing soon, so I could see them moving the Star Wars Meet and Greets over there. Maybe the Jedi Training too if there's room.
I think that the biggest issue in 2019-2024 will be the crowds that come for Toy Story Land and Galaxy's Edge. Demolishing attractions during that time won't help with crowd management. A major problem for the park is that it's not in a great location, so it's pretty much landlocked from expansion. They could move some of the backstage area for something new near the northwest corner by Fantasmic, but that's probably all they could do without moving the entrance and taking some of the parking lot.
I don't know what's going to happen, but I wouldn't expect anything major right away.