It's not like W is gonna move his cell phone off the speed dial. If anything, Rove can machinate with impunity from within the more lucrative (and less scrutinized) private sector. Or start grooming another horse to ride to high office. Or run off, make a ton of money and connections, and come back when the political climate is more receptive, a la Dick Cheney.
Ding dong the witch is off gaining strenth, marshalling resources, and learning new and more powerful magic.