Like many of you, I love Sherlock. I like the Cumberbatch and the Freeman and the all of it. Season three started airing a couple weeks ago and will stop airing a few days from now. I'm not really sure how to get it into my eyeballs yet, but when I do, I'll probably like that too.
Luckily for me and other fans, Sherlock head honchos Steven Moffat and Mark Gatiss claim to have stories plotted not just for a whole fourth season but a fifth as well. And according to Moffat, these future show plans are "the best we've ever had." (Code for: Cyborg-Moriarty)
Seasons of Sherlock are pretty much just three little movies, so this means someday there will be a total of six additional Sherlock movies for us to enjoy. They can't really make them until Benedict Cumberbatch and Martin Freeman have enough time, so season four won't get rolling for probably another five or six years when their star wattage has died down a bit. As it will likely make them very popular again, we'll probably have to wait and additional seven years for season five. To help stretch it out a bit, the BBC will only air one episode of season five per year. But on the bright side, technology will have progressed enough by that point that we probably won't raise a fit about Cyborg-Moriarty.