The show runner and main writer for Doctor Who and Sherlock, Steven Moffat, recently told reporters that he has no intentions of “giving up” Sherlock. Although Doctor Who would be easier to stop writing for;
“Eventually, I’ll stop doing Doctor Who because it stops me doing anything else, but Sherlock doesn’t swamp my schedule.”
“I could imagine we’ll come back and do Sherlock fairly often for many years, rather than very often for a few years.”
Moffat and series co-creator, Mark Gatiss are currently planning a fourth and fifth series for Sherlock. The eighth series for Doctor Who is being filmed now.