What the fuck, BBC? Stephen Moffat is a "problem"? Even if you don't like his version of Who (I understand the ratings have dipped a little? I think? But I also thought that didn't really matter to the BBC?) the guy has generated several other popular shows, including Sherlock, and the dude works with Stephen Spielberg, which you'd think would give him a little cachet.
I don't know the guy, maybe he farts on the BBC president every time he sees him or something, but otherwise that seems like classic internal politics conspiring to kill the goose that lays the golden eggs.