I dont think there is really any pressing need for the UU anymore. Its original mandate is gone and sales are dipping steadily. Honestly if Marvel was gonna reboot anything at this point it would have to be line-wide like DC did.
Not that I dont love the UU, but sooner or later itll be cut down to just USM and occasional other minis for X and A, heck its half there already. I think a real push should be made to make USM a stand alone high profile title.