I have to agree that's probably the opposite of what will actually happen.
I do think there's some chance we'll see a few newly cast X-men who are intended to return and be the backbone of the new X-Men franchise after the multiverse saga ends.
But they haven't spent the last several years forging new contracts with Maguire, Stewart, Jackman, Grammar, etc, just to show them all once and forget they exist. Secret Wars 100% exists for the specific purpose of getting all of these actors together in one movie (with the returning MCU actors as well, of course). If they weren't specifically aiming for exactly that type of blatant nostalgia then they would've picked a different story to adapt than the highly action-figure-mashup driven concept of Secret Wars. (And in the highly unlikely event they picked Secret Wars for truly narrative purposes and not to enable the massive nostalgia peak, they also would not have jumped on the nostalgic variants train for No Way Home, MoM, The Marvels and D&W.)