More like this
I'm against him included at all, but no matter how I view it, that's all casuals know..especially after 7 movies. They're not gonna have an X-Men movie without Prof X. Or you can say they won't have one without Magneto, which of course brings in Prof X by default.
I still think Decimation, Endangered Species & Messiah Complex is the best storyline...set Messiah Complex on the heels of the second snap. Mutants have been reduced to let's say thousand all over the world, no new mutant discovered in 20 years. After the second snap, a handful of mutants are discovered, and the first mutant baby is born...one that is instantly identified. The remaining X-Men set out to find the new mutants and the baby. Cyke, Storm, Gambit, Rogue, Kitty, Nightcrawler, Iceman, Beast, Angel, Bishop, Jubilee & Boom Boom. Or some combination...8-12 members, so you can always split into teams.
Friends of Humanity would be excellent, led by Graydon Creed and whoever else you want to throw in. They set out to kill or at least use extreme prejudice tactics against mutants, and some want to kill the baby. For a formidable foe, the Friends of Humanity get Sentinels built.