No, nobody joins the MCU. Disney buys DC Comics and forms a new movie studio to make DCEU movies. They quietly rebuild the DCEU and the Justice League franchise, with an eye on multiversal stories and "stunt casting" MCU alums as cameos and even extras in DCEU movies... while the MCU plods along as normal, except for their own weird cameos, with their second-gen MCU stars.
JLA builds up to and completes their Endgame moment and announces they're going to do a Crisis as a soft reboot-- having both the original actors and newer younger actors playing different versions of the same characters.
Except that instead of doing a Crisis, DC does a Crisis To Be Continued, while Marvel does a Secret Wars To Be Continued and then... after both movies have had their run, and people are starting to hold their breaths for the sequels... Disney announces that their next Big Superhero Movie is going to be called Amalgam.
Afterwards, both multiverses break and bow and go their separate ways, but at least one per Phase (each), there's a standalone movie or a Disney Plus TV show about crossover stuff.
JLA builds up to and completes their Endgame moment and announces they're going to do a Crisis as a soft reboot-- having both the original actors and newer younger actors playing different versions of the same characters.
Except that instead of doing a Crisis, DC does a Crisis To Be Continued, while Marvel does a Secret Wars To Be Continued and then... after both movies have had their run, and people are starting to hold their breaths for the sequels... Disney announces that their next Big Superhero Movie is going to be called Amalgam.
Afterwards, both multiverses break and bow and go their separate ways, but at least one per Phase (each), there's a standalone movie or a Disney Plus TV show about crossover stuff.
