Let's face it, if he wasn't already working on Who, then he'd be the first person they'd be calling up to see if he was interested in writing for it.
And the mess of Victory of the Daleks wasn't his fault, that was down to the director, and more than that the decision to try and restart with an entire new production crew as if that hadn't worked out horribly on the first block back in 2004 (that time it was unavoidable, obviously. Doing it again in 2009 was just plain stupid).
I wasn’t aware of that, but it did strike me that VotD was a bit of a poisoned chalice and that he was likely given a hefty shopping list by Moffat.
As I understand it, VotD was intended to be a 70 minute special to go out on May day. But it was the first episode shot by the new production team, and too much of it didn't work and had to bereshot (just as parts of Rose had to be reshot five years earlier). Unfortunately there were limits on how much could be reshot, so the final episode consists of the stuff from the original shoot which was up to scratch (which tended to eb the conventional character/dialogue scenes) and the stuff which simply had to be reshot to make the episode work (the creation of the new Daleks), with the rest (Daleks playing nice) getting cut back .
As a result, the three plotlines are out of balance, with the 'Talk Bracewell out of exploding' stuff being a far greater proportion of the 45 minute transmitted version than it would have been in the planned 70 minute one (even though the actual minutes spent on it are the same). IYSWIM?