Uhh, you are aware of a little movie called Batman v Superman, right? It's coming out in 3 months, and was originally meant to be released last July. That'll be followed a few months later with Suicide Squad set in the same universe. And Wonder Woman is actually in production
Fox expand their X-Men universe with Deadpool (1.5 months away) & Gambit (next Autumn)
As others have mentioned, studios have already tried and failed in the meantime. Sony with their Spider-man universe, Fox wanted to connect Fant4stic to X-Men and that.....