Concerning Avengers 4...
spoilers:end of spoilers
Rumors from other sites state that Avengers 4 could be 3-5 years after the events of Infinity War (an older Cassie Lang has been casted for Avengers 4 apparently). If that’s true—and this is a big IF—then the M’Baku or Shuri decision for ruler might go either way.
I still believe M’Baku will be picked, but this rumor, if true, changes things.