I’d love to believe that Johnlock will happen and the theories are so (!) good, but it’s not going to hapen. They (being Moffat and Gatiss) said so in interviews

(at least two that I have read) and what we see is queerbaiting. As much as I wish that this wasn’t the case, the Johnlock conspiracy is not going to come true.

uhmmsherlock:

Today you sit between the woman you have made your wife and the man you have saved. In short, the two peope who love you most in all this world.

And I know I speak for Mary as well when I say, we will never let you down and we have a lifetime ahead to prove that.