Actor Benicio Del Toro, who has played the Collector in a number of MCU movies, has theorized that his character actually survived the events Avengers: Infinity War.
If the Collector is actually still alive after Avengers: Infinity War, as Del Toro seems to think, this team-up movie may end up being a real possibility.
It looked as though we had seen the last of the Collector for four years, until Del Toro finally returned to Marvel earlier this year in Avengers: Infinity War.
All in all, it would be great to see more of Benicio Del Toro in the Marvel Cinematic Universe, as Del Toro hinted at in his interview with CinemaBlend.