I just posted over on the "post mortem" thread. Stephen Moffat said that there was a theme that we'd missed, and the first thing that sprung to mind was this conversation over here! I still find it hard to believe it's the case, and I'd hate it if they turned it into some sort of love triangle, but the idea (of Sherlock falling for Mary) did seem to fit (and also fits with your post, Ukaunz). I'm not completely serious about this, but it was funny how it popped into my mind (probably because I'd been reading this thread recently!).