Honestly...I'd be pretty worried if the goal within the MCU in general was to go in with the mindset of constantly making as many films as they can for these characters within the same continuity since:
1. The role is likely to be recasted and Idk about you guys, but I'd have a hard time adjusting to the new cast members who've taken on roles that were solidified by others for a long period before they came on board. I know people will bring up the Bond Series as an example, but honestly, isn't one of the goals for all of these films to help audiences get connected with these heroes during their solo adventures before getting more excited in seeing them work together in the Avenger films? I mean, it could all be in the same continuity, but you can easily lose the emotional investment that the audience had within a character for 3 films once you recast that character after that many films.
2. Plus, there's only so far that they can go with threat levels before everything becomes redundant, unoriginal, and similar.