I'm perfectly ok with that. If you ask me, WCW and ECW never should have shut down in the first place though.
By allowing both groups to close, Vince lost a good many mainstream wrestling fans.
The question though, is if those ECW/WCW fans that are no longer around, are willing to return. If they do it, they should never mention any of the other shows. The stars on each show should be familier to each brand, like Steiner/Booker on WCW, the usual guys on WWE, and RVD/Dudleyz in ECW.
Then, slowly, add stars to each brand by having them "leave" WWE in order to work for the other organazations.