Captain Marvel should play a huge role in Phase 4 and I imagine that she may even be the leader of the Avengers going forward as she was for the Mighty Avengers in the comics.
Captain Marvel was brilliantly set up in the post-credits scene in Infinity War to make a serious splash in the MCU.
Brie Larson’s Carol Danvers isn’t just going to show up in Captain Marvel and Avengers 4 and then peace out to wherever she’s been hiding for all these years.
Captain Marvel is a born leader with a military background, who always fights for what she believes in, no matter what, making her a great successor to Cap’s role.