Steven Moffat believes Doctor Who will last for another 6 seasons.
Speaking ahead of the ninth season this fall, the executive producer/writer said he thinks the time-travel series will go a “minimum of 15″ seasons, but is hoping for a 26 season run, per Doctor Who Magazine (via Digital Spy):
“I thought it would last 10 years. I didn’t think it would last ten years with BBC Worldwide trying to get me in a room to talk about their plan for the next five years! It’s going to do a minimum of 15. I mean, it could do 26!”
Moffat also lauded the Doctor Who‘s ratings, noting that they are “pretty much the same” if not bigger than when it was rebooted ten years ago:
“Ten years on, our ratings are pretty much the same. Actually, internationally, bigger. No show does that! You’re meant to go down! Doctor Who just stays. It’s extraordinary!”