They've got talent sitting there sucking up the funds. They finally realize that the brand is starting to become crap. With Vince having (basically) no competition, he can do whatever he wants. Remember Katie Vick? Think he would've done that if Nitro was still on the air?
If they're doing this for financial reasons, look for injured people to be cut. I think the only ones on the injured roster right now are Chris Nowinski (expect him to be cut) and Mark Henry. Henry might be down in OVW training, though. Cena and Kane are out filming new movies.
The BEST possible move that I could see: Flip the script on the brand split. Make Raw the primary talent ground and make Smackdown for the developing guys. I'd watch Smackdown more often. Kick off Big Show, Booker T, all three Dudley's, Eddie, Hardcore Holly, Cena, Angle, RVD, and Undertaker to Raw, and give Smackdown Garrison Cade, Henry, Matt Hardy (Face it, when he jumped to Raw, his career died), Maven, Rosey, Hurricane, Sylvain Grenier, Tajiri, Tyson Tomko, Edge and Christian.
It's a good idea, I think. It'd give the main eventers something to fight about.. the developing "not-quite-there" stars could feel proud. Edge and Christian would headline Smackdown, sorta like the "new blood" in WCW's dying days.