The prior I blame on Xavier being an uncaring, manipulative shit as usual. If it doesn't fit his plans, he doesn't care and he is happy where he is, thank you very much. Besides his X-men have shit to do don't you know, that will only occur with the reading of his will. Or that is how I would have justified it if Bendis hadn't decided to abandon the plot thread with the will entirely.
As for the latter, that's Bendis deciding to abandon the book mid plot threads and completely abandon shit he set up because he is jumping shit. In other words, shitty story telling because someone got tired and lazy midway through his obligations. I also blame that for Havok and the rapid Kitty/Quill stuff. Havok went from mutant supremacy and kill all humans to, "Well, we are just going to defend mutants and send a message."