So what Marvel need isn't a Crisis on Infinite Earth's, but a Crisis on Infinite possible future timelines...at least X-Men needs that. AoA, Days of Future Past, Bishop, Cable, Rachel Summers....please, one timeline with one future is enough.

To say there is only one possible future would be crazy. That would mean there is no free will. Everything is predetermined. The whole point of comics is to entertain the possibilities. Rachel is gone to the future, and Nate is stuck in the present. Everything is OK.