In a previous interview Matt Smith may have given the impression that he was leaving the series soon, however in another interview with What's on TV, Matt had this to say about his future.
"We work very long hours every day for nine months. The schedule is pretty brutal, but I'd never complain about it. I love playing this role, and I don't want to give it up any time soon,". "I feel very lucky. In the current climate for actors, I'd never say, 'This is too much' - quite the opposite, in fact. I'd say, 'Bring it on.'"