Hi! I saw that you were theorizing before about Sherlock so I really want two things let out of my chest since I saw the series and I am curious what you think.
First of all, I have always had this theory that Moffat and Gatiss wanted Johnlock as their end-goal. I studied Film and screenwriting which taught me a lot and there is NO WAY they made all those things suggesting that their relationship is keep building from colleague to friends to something else in the first two season just by share accident. There are so many ways they could have done it and I don't believe it that they wanted queer baiting just for the sake of it THIS much without a resolution. I especially not believe it since Gatiss is gay and he should know more. Not to mention that the interviews around the first two seasons were quite telling sometimes that they were not opposed to the idea. Then something happened. My theory is that either the BBC or whoever was charged of Doyle estate and Sherlcok Holmes right (which became free from this year), or maybe even both of them could see where this is going and let Mofftiss know that they can't do that. They are bringing the money and they can call the shots even though they are the creators so they needed to compromise. And you can see they clearly made a turn from Season 3. And I think you can tell about the interviews as well from that period. I believe that's (one of the) reason Martin had enough by the end probably and they just did the job they had to do. That's what I felt. Like they were acting but it didn't really have the....spice if you know what I mean. What do you think? I have always had this theory but since studying film and how film production work and the writing progress I am convinced that they thought it through and they had a clear intension, a long game but they need to stop.
2. This second one is not a theory but it always really bugged me. In the last episode, the Final problem when Sherlock had to call Molly to make her say I love you (let's not talk about the part how rubbish it was), why Molly looked so...pardon my language...shit? She looked so done, like she was crying for hours before and it was just super weird. What was the intention behind it? It was never really explained. Or did they want to suggest that she had a shitty day and she has no patience today for Sherlock or what? She was so completely different than normally. (And I try not to rage about the fact how they underminded her character but that's another story). What do you think about that one? Honestly it really bothered me when I saw that.
Sorry for the long post. This is something I have in me for years and I didn't really have anyone to share with. If anyone else wants to comment on it, go ahead. (And english is not my first language so sorry if there are grammar issues)
Sorry for the delay in a reply, I always need to switch my brain into Meta Mode™ to answer these types of questions, and since I don't do that much anymore, I have to go back and see what I used to theorize, LOL. So, let's go:
Your theory aligns mostly with my own: either the (at the time) Doyle estate got involved since they saw where the plot lines were leading to post-S3, OR – and this is the one I lean more heavier towards – BBC interference. I believe there was a turnover of higher-ups at BBC at the time, if I recall correctly, and perhaps their vision for the show differed from what the story was being told. I agree with you – there is NO WAY that they DIDN'T see what they were doing...
Which then leads me to the third (and, I fear, the actual answer) option – queerbaiting to bring in the numbers. Moffat has done projects in the past where he never follows through with the queer romance or they die / happens offscreen, and Gatiss has openly admitted to using homoeroticism to bring in an audience after the downfall of S4. So It's also likely that they got too full of themselves, and without a third writer to reign them in and make a cohesive narrative (at the VERY least make S4 make sense to the other previous episodes with or without Johnlock endgame), they wrote something no one liked at ALL (even though they LEGIT thought TFP was great enough to nominate for an Emmy, if I recall correctly, and backed down on that claim after it was critically panned), including the critics AND general audience, basically told everyone they were stupid, and picked up their ball and went home. And they refuse to say if Sherlock is done at this point because the Brand™ gets them money still.
None of the actors seemed very happy after S4, even though they worked SO hard to make the best with what they had been given. Martin was DONE in interviews, Ben is SO bad at faking it, but he tried, bless his heart, and I think at this point, with both Martin and Ben busy with their own careers and side projects, I don't think we're getting anything within the next 5 years. But I've been surprised before.
Ah, yes, the Molly Thing in TFP™, one of the things that just... ruined her entire character, devolving her back to ASiP Molly. The running theory – or at least my theory – is that she is a placeholder character for John in John's coma nightmare. She is John's inner feelings, the ones John himself feels like he can't express to Sherlock because he fears the rejection from Sherlock. I PERSONALLY think that's how we're supposed to read that scene, because otherwise any other context is weird and demeaning to her character arc.
But then again, the entirety of S4 is one big FU the series without an S5 to clean it up.
I hope I helped a bit with this response! Sorry if I missed anything, I'm exhausted and need some sleep LOL.
Feel free, friends, to add your own thoughts.