The Scalet Witch has used her magic to wipe out most (if not all) mutants. That is NOT going to be good. If I remember, there are several deranged evil mutants that think they are gods and the superior race just because they have (OK, had) superpowers, and that mutants should rule the Earth. By wiping out their race, they are insiting their wrath. Thus, I think now The Scarlet Witch has A LOT of pissed off ex-mutant militants just itching to disembowel her. I mean, what do you think happen if some random guy popped into our world and turned all Jews and Muslims into Caucasian guys?