When it comes to the idea of mutants becoming a hive mind cerebro worries me a lot more than Krakoa at this point, after all Apocalypseīs backstory not only served to explain his ideology and motivations but also those of Krakoa. For Krakoa mutants once again living there and sharing itīs space is a return to a status quo in which itīs content and feed while mutants have a home and security they didnīt always had.
Cerebro, on the other hand, is actually a hive mind that has the memories of almost every mutant ever born, itīs for me a call back of what Nimrod used to do in PoX, he killed mutants and then forced their mind into a hive mind for such a long period of time that there was no longer any different between one mind and the other, no matter the level of tecnology developed by post humans so when it came the time for the phalanx to take over humanity, not even the librarian could find an answer to change their future in the old mutant records of Nimrod.
So more than Krakoa, for me itīs the resurrection process the one thing that presents more questions, especially if we consider X-force and Way of X showed how it can affect characters like Domino, Colossus, Quentin Quire or Pixie even if the change is subtle.