MCU: Predicting 25 Movies Marvel Will Make After Phase 3
17. Bucky: The Winter Soldier
The Film
The other option to replacing Cap with Bucky would be to give him his own movie and follow his Winter Solider backstory even further down the rabbit-hole.
Or maybe we could see him and Black Widow share their own film, revealing that they have shared history, as in the comics.
Any Evidence?
Again, the fact that Sebastien Stan has more films left on his Marvel contract (even beyond Black Panther) suggests that there are some plans to continue the character. Talk of a spin-off so far has been pretty quiet though.
Any Groundwork?
Well Bucky still has questions about his past to answer, and further past "jobs" he might want to atone for. The idea of him and Black Widow teaming up would arguably be even better, and they have seemingly shared recognition already.
In an axed scene in The Winter Soldier, Alexander Pierce (Robert Redford) actually tried to stop Romanoff by reminding her that "None of your past is going to remain hidden. Budapest, Osaka ... not the Children’s ward ..." It's almost like that was supposed to tie her and Bucky closer together.