We only risk saturation with anything if it becomes impossible to avoid and Sherlock Holmes is easy to avoid. The crime section of the bookshop can be walked right by, internet sites are well signposted and thus equally easy to avoid and, finally, the screen incarnations appear only every few years and are repeated on relatively minor channels.
Matters Sherlockian also tend not to take over the media. We don't see huge amounts of screen time (often on news channels) devoted to dissecting every last decision or movement in an episode of Sherlock. This does happen of course but usually on social media (see internet above).
Because of this the world at large is not likely to feel any sense of Sherlockian saturation. As for us Sherlockians, I think we'd probably fail to notice saturation point.
Written by Alistair DuncanBuy my books here