Fair enough, and I'm hoping this is how the situation ultimately resolves itself or gets resolved, that as much as humans and mutants may vie over whose offspring ultimately inherit the Earth, they both have a common investment in there actually being an Earth to vie over in the first place. I mean, even Powers of X showed that as bad as things got in the future, neither what humans evolved themselves into nor mutants wanted the Earth (and themselves) consumed and/or assimilated by the Phalanx, so that might be what tips the scales over in favor of cooperation.
In fact, Martin Luther King said it best, I think, something to the effect that humankind has ultimately only two paths --- coexistence or nonexistence. Either that, or as Benjamin Franklin said, "We can all hang together, or we will most assuredly all hang separately." In a nutshell, we can choose to cooperate or at least put up with each other for our own and the greater good, or we can keep fighting and squabbling amongst ourselves, as the Green Goblin said to Spider-Man in the first movie by Sam Raimi, "in selfish battle again and again and again until we're [all] dead! Is that what you want? Think about it . . . !"