Fans have longed for a 'Doctor Who' and 'Sherlock' crossover for a long time now, and in a recent interview with EW, it appears that the show's creator, Steven Moffat, shares the same sentiment.

So it goes to show, what would be the reason that the two most popular shows on the BBC couldn't collaborate together? While Moffat believes the fans should get the content that they want, not everybody on their team feels the same way.

Moffat states:

"My instinct-and this is probably from years of doing Doctor Who-is I'm just such a tart. If people want to, we should give it to them. But I got persuaded by Mark, Benedict, [executive producer Sue Vertue] and Martin saying, 'Look, it will never be as good as they think it's going to be', and then I say, 'Yes, but we'll just bang it out and make it as good'. 'Yeah, but you can't give everybody everything they want all the time'. I'm in the camp of giving them everything they want. But I think they're sane and right and I'm just a tart."

So the real reason seems to be the disbelief in its success by the actors. If Mark and Benedict can get onboard with the idea or a compelling script, this is still a possibility.