Sherlock is such an awesome series, and we've heard that Steven Moffat is already working on seasons four and five. The big question is… when will they end the series? I figured it would happen at five, but according to Moffat, "It will continue until Benedict gets too famous." Yeah, he said it half jokingly, but we all know that he's serious. There's no doubt that Moffat, Benedict Cumberbatch, and Martin Freeman will continue to do the series as long as they can. The two main actors are already getting busier and busier, so there will come a time when they won't be able to do it anymore. I think they will all stick with it as long as they possibly can, though. Hopefully it's a long time!
Cumberbatch was asked whether he feels overwhelmed playing Sherlock, and the actor dismissed any notion of that, hinting that he doesn't really see an end date,
"I'm fine with it. I'm going to keep going with it. It's a schedule-providing thing... I love it. I find it very invigorating."
So Sherlock fans can rejoice that the excitement to keep the series going is still there. Who knows how long the series will run, but I will be completely happy with whatever they can give us. If they keep pumping out awesome stories, then people will keep watching, and if people keep watching, then hopefully the show will go on!