Quiver

Yeah, the problem with how they're building the universe up makes it a bit unstable... They could make several Avengers teams post Infinity War, but unless they keep expanding the universe(which is not financially viable) they should think about closing up shop soon.

Well, there's also a problem with the actors. Unless they re-cast (which will be controversial) sooner or later they'll have to address the fact that the actors are going to age out of their roles. 

(Though, Old Man Steve might be cool)

It'll still be epic