If you think MLS (or any league) would be willing to go from receiving money for their rights to giving money to EA, you're crazy. And even if MLS decided to do that (they wouldn't), people would still end up largely playing European leagues because of the extra competitions and the lack of "true" MLS experience.
You still wouldn't have an accurate US Open Cup (and the Canadian teams still wouldn't have the Canadian Championship) without adding NASL/USL teams. There still wouldn't be a CONCACAF Champions League, or at least anything but an incredibly watered down version with just MLS and Liga MX teams. The roster rules still wouldn't be the same (because they're so weird and arbitrary that not even Football Manager has been able to replicate them even with an employee dedicated to overseeing MLS implementation).
And you can already predict what's going to happen to players who are sent to the new USL Pro affiliates when those start coming into play: they'll just disappear from the game.
While I'm all for MLS having actual stadiums and more face scanning and whatnot, you're never going to have MLS recreated fully, and MLS is definitely not going to pay them to do it.