Yo, homie. Please elaborate on your rumpelstiltslock idea. I can't quite wrap my head around it, but I'm getting curiouser and curiouser.

Welllll…

Baby Watson gots to go somewhere. We’re working under the assumption that Mary Watson is a romantic obstacle and Baby Watson is a pawn. Baby Watson could be completely fake too, but I just think that’s too easy of a way out for the writers to take. You make a baby, you deal with the baby fallout. So something happens to Baby Watson next season, something that is a little more compelling than Uncle Sherlock the babysitter because that’s called plot. Emotional turmoil, pressure points, the constant danger that is being in the acquaintance of Sherlock Holmes? Kidnapping is the obvious choice, but we all watch the show - they’ve got to make it ‘clever’…
True Name Power. They’ve already built this up so much, it’s crazy. Sherlock and John both know each other’s full names. I will happily take all the symbolism I want from that on its own, but it’s a huge trope in fairy tales as well. You need a person’s true name to curse them, every good witch knows that. Names are power. Who points out that we “don’t even know her real name,” even though it was conveniently provided to the protagonists on a flash drive that may or may not have been read by one or both of our heroes? That’s the one…
Fairy Tale Villain. Moriarty already told us what part he means to play: “every fairy tale needs a good old-fashioned villain.” Sherlock is (or is not) the hero, John is the damsel in distress, CAM is the slain dragon, Mycroft is the Queen, etc. etc. We’ve done Hansel and Gretel already. Fairy tales are Moriarty’s jam, and they laid them on thick in s2, but even continued with the themes through s3 as well. What could be more appropriate for Moriarty’s return thannn…

RUMPELSTILTSLOCK!

Imagine: Moriarty spirits freshly minted Baby Watson and Mary Watson away, with or without cooperation from bad, bad Mary herself. Did she owe Moriarty for fixing up her Mary Morstan identity? Is Moriarty just being his usual, crazy old self? Is this a powerplay by Mary? Who knows. John and Sherlock panic until they receive Moriarty’s demands: I keep your baby unless you can guess Mary Watson’s real name. 

Then it alllllll comes out - who didn’t trust Mary and peeked the drive? Sherlock? Both of them? Or is it even John’s baby? Does Mary spill the beans and sacrifice herself for John, or has Sherlock figured it out already that the baby isn’t his? Is Mary Moran? (hint: yes) There’s so many directions they could take a showdown like this!!