The average time for a Doctor is usually 3 years, and Smith does seem to want to try other projects lately (Although his performance as the Doctor is still good).
If season 7 will be Smith's last, I suppose maybe we'll have some sort of announcement about him leaving and the next Doctor before the end of the year. But all this is really speculation at this point I think.
If season 7 will be Smith's last, I suppose maybe we'll have some sort of announcement about him leaving and the next Doctor before the end of the year. But all this is really speculation at this point I think.