I repeat, a good thing.
Kieron Gillen writing one book and Jason Aaron writing the other book? While Aaron presumably continues writing Wolverine? When you add in the other strong writers on the X-Books, like Rememder, Liu and David, and it is a good time to be an X-Fan.
So if Marvel feels they need to re-launch Uncanny X-Men at #1, it is not a big deal. Especially since they can always just re-number it at #600 to satisfy those who like to see their books hit big numbers.
Ed Brubaker's Captain America run.
Kurt Busiek and George Perez's Avengers run.
Brian Michael Bendis and Alex Maleev's Daredevil run.
Did it really affect anyone's enjoyment of those stories that they took place in re-numbered titles? No way. It is not a big deal. Getting Kieron Gillen and Jason Aaron to write your two ongoing X-Men titles? That IS a big deal.