I think that after Secret Wars. The X-men line should have been shunted to the New Universe Earth. A planet that did not have superpowered individuals until the white event happened. This would give the X-men the benefit of not being on a planet crowded with other Superpowered individuals. The X-men would start out with the original 5 + Wolverine While introducing other X-men along the way like Storm,Nightcrawler,Colossus, Rogue,and Kitty Pryde. Eventually Professor Xwould decide to train and help other young mutants over a 5 year time period. Introducing the New Mutants and Generation X.
Team books.
Uncanny X-men The core book that has a core cast and other members that sporadically appear in support capacity such as Forge being the head of Tech support and Cecelia Reyes being the Resident physician.
Astonishing X-men would be a hybrid of X-force and a SHIELD like division of X-men. This would be the team that lives the dream out in society. This book would look into what it is like to try to live a normal life while being a X-men would be like. A modified X-corp that would focus on International globetrotting adventures. This is the team you call when The Uncanny team is busy with another conflict.
X-men Unlimited would be similar to past premises of the book. Focusing on spotlighting characters in Solo non- X-men related adventures, and non-X-men mutants and how the world reacts to them.This book would also tell stories involving X-related characters and locations. The book would also feature X-men solo mini series.
Xavier Institute would be exactly what it is called. A book revolving around the school and it's students.
This would offer a variety of X-books to read that don't step on each other toes.