Indeed, you can easily see the show continuing with the occasional Christmas special at five year intervals. It’s the sort of thing that could quickly become a beloved tradition, a special something extra.
In that format, the show would be free to be a little more experimental. Perhaps it could be akin to The Abominable Bride, which saw Sherlock in Victorian times – Moffat and Gatiss are both big fans of the Basil Rathbone movies that place Sherlock Holmes in World War II, so that’s definitely something they might consider doing for an episode.
Here’s a thing about Sherlock – I reckon a break is a good thing! I’m pretty fond of the show, and I’d like to see it back eventually; equally, though, I do also reckon taking some time away might be to the benefit of all involved.
I mean, admittedly, that’s no huge insight – the long breaks were baked into the format by series 2, as big a part of the high concept as the modern era setting – but still, I think, true, and worth saying in amongst the clamoring for a speedy return. Absence makes the heart grow fonder, after all.