I assumed the brain-overthrowing crew (plus brain) would optimistically get to wreak havoc for about 3 months... before being utterly annihalted by anyone with a stake in the proceedings, and then some. There's still that whole army marching towards Baldur's Gate. Made out of figures that paint it as threat to all neighbouring countries, nevermind revenge.
If you're roleplaying someone smart and evil, it doesn't seem like an appealing ending. The crimes involved are much too high profile.
