Yes, and Nightcrawler died, yet when resurrected is still called Nightcrawler. My previous statement is obviously predicated on the assumption that the MU would be essentially the same universe as 616 restored. It has been demonstrated that most, if not all, of the 616 storylines pick up where they left off, and there are only a handful of stray elements from other universes such as Miles Morales and Old Man Logan, which is not a new phenomenon. Of course, if it turns out to be truly an entirely different universe or true amalgamation of different universes, then that's a different story. My response regarded only the fact that you stated it wouldn't make sense to call it 616 if it was the only universe left, which is different than if you had said it wouldn't make sense to call it 616 since it's a unique and different universe from what we now call 616.