It's Moffat that's gone stale; him introducing a new Doctor when he can't even write recognizably different companions stings me a bit. If he creates the next Doctor, we could well have three/four more years of Moffat-style storytelling. Moffat also can't seem to keep his full attention on Doctor Who, which, budget considerations aside, contributes to them only producing a few episodes per year. He's been repeating himself and taking the series in directions inconsistent with the classic series.
Despite no announcement being made, I'd be surprised if Moffat and Coleman stayed on after Matt leaving.
She's gorgeous, but she was introduced as obnoxious, reintroduced as toned down, and reintroduced as a blank slate.
OPINION: In series 5, the Moffat episodes outshone some pretty weak episodes by other writers. The opposite has been true since, with the normal episodes being solid Doctor Who, and Moffat's finales and arc episodes annoying the living hell out of me.
We need less changes in Doctor and more changes in head scriptwriter. Both RTD and Moffat started out very well, but became increasingly repetitive and self-indulgent, showing quickly the limitations of their writing style. Life depends on change and renewal ....