They've just announced that the next series of Doctor Who will be Capaldi's last.
I don't really know what to say, Capaldi should've been on longer, and he should've had a chance to move beyond Moffat's tenure.
That being said, Capaldi's era is four years long (2014 - 2017), which is the same as Tennant's and Smiths (06-09, 10-13). And much like his predecessors, Capaldi's had three full series. But at the same time, it feels as if his era is being cut off at the worst possible time. Series 9 had some episodes I didn't like, but overall, I thought it was moving in the right direction.