Will Graham is and will always be my friend.
There was this famously gay English icon/playwright/prisoner Oscar Wilde who wrote “The Importance of Being Ernest.” His character Gwendolen said “This suspense is terrible. I hope it will last.” Mark Gatiss once tellingly misquoted the play when discussing Reichenbach:
Asked how guilty he felt about teasing viewers with the cliffhanger, Moffat said: “It’s not teasing them about the fate of a kidnapped relative.
"It’s a television program! So not at all. That’s storytelling."
Gatiss added: “Also, Doyle threw him off a waterfall and left it for ten years, then it came back. We left it two and a half minutes!
"We’re quite nice. Also remember the great adage - the suspense is killing me, I hope it will last." (x)
Suspense is what has made this show an international phenomenon. Pair them off canonically and the pre-coital erotic buzz expends itself. It would be like letting the air out of the balloon. They have no plans to end the show.
Keep in mind Gatiss is a horror aficionado. We yell “kiss him!” the way you’d yell “don’t go chasing that sound in the dark alone, idiot!” The difference is in horror the victim always does and we like that because we’re blood thirsty. A Johnlock kiss leads where? You can’t domesticate Sherlock Holmes. There’s nothing more boring than marriage. Even murder can’t spice up a wedding scene.
We will get oodles and oodles of unrequited desire, however. That’s part of the engine. We’ll never hear if Sherlock is straight or gay ergo suspense…