I've been asking for a movie for a minute now...
I personally would like to see other characters get the chance to shine. Humberto Lopez, Amadeus Cho, Kamala Khan, America Chavez. Plus they have the Fantastic Four AND the X-Men now. I don't want to see any of the current Avengers after 4. Any movie dedicated to Bucky Cap or any other stupid thing like that is a movie taken away from something potentially new and interesting.
The X-Men alone open up a whole new possibility of stupid shenanigans for them to do. A Bucky or Sam led Cap movie is just going to be the same tired shit we have seen two dozen times now. Let's see something new.