I don't think a huge team of X-Men already training a bunch of mutants like it was in the 2000s comics era of the X-Men, would be a good idea.
And which Mutants would appear as recruits that the main X-Men would train? Elixir, Rockslide, Dust, Anole, Gentle, Glob Herman, Quentin? the original new mutants line up?
I would like a big team from the get go as I don't wait several years just to see a dozen proper X-Men members on-screen. That big team is divided into two squads and each squad get their own X-Men movie. But I also do not want the X-Mansion to have hundreds of background mutants as we already saw in the fox era, as its unlikely to showcase them all well. And I also don't want someone like, lets say Surge getting more screentime/development over someone like Psylocke.