Simply put, everyone appears to be in agreement with Evans, so any announcements for Phase 4 could prove big for Johansson’s future as Black Widow.
As of right now, Black Widow has not been confirmed to be a movie that Marvel Studios is actively developing.
There is simply no room or time to get Black Widow ready in the immediate future, but Phase 4 could be the eventual landing spot.
She has even admitted in the past that the biggest obstacle for the Black Widow movie is simply timing, so once Marvel’s production schedule becomes lighter and the final events of Phase 3 play out, the film’s future should become more clear.