I know the point you are trying to make, but the F4 and the X-Men are two different premises, and is not 1975 anymore. The introduction of the All New made sense back then (from a story point and a marketing perspective) especially since the title was about to be canceled and the original cast wasn't able to support it at that point. The way the market is now, I don't see any of this new characters sticking long after their creators leave. Oh well, it is how I feel and my opinion, if the writers do their job well and manage to make an entertaining title is all that matters at the end, I just don't see some of this titles lasting long, but I am interested in X-factor.