yeah the next two big 2026/27 movies are consolidating all the Marvel heroes back into a single universe. Avengers Doomsday will involve the origins of Dr. Doom, probably in his own universe, probably trying to figure out a way to cross over into another universe for one reason or another (find a dead love, power, Latvia, etc) and Avengers from multiple universes assembling to stop him. Originally it was gonna be Kang doing this. You can see an Infinity War type ending where Doom wins and Avengers lose with universes dying.
Avengers Secret Wars is probably multiple universes collapsing into a single universe, maybe the Beyonder is involved, definitely Dr. Doom is involved. We'll likely see a single universe with a new set of core heroes at the end - Miles Morales replacing spiderman, X-Men coming in before their movies start, Fantastic Four in the MCU, and any variants replacing "main" heroes like a new actor for Black Panther, probably a new Iron Man (woman), a new Thor, a new Hulk, on and on.
the only real question is what of the 2025 movies will actually really tease this, and will it be real or bullshit like the stingers for the last few shitty movies where people just cross universes without making much sense. Thunderbolts is 100% going to tie into Doom. Fantastic Four will probably just stinger the F4 being deposited into a new universe. Who the fuck knows with Captain Wakanda.