GUYS I JUST HAD AN AWFUL THOUGHT
What if that is the legit final problem? What if what we see on screen, Sherlock having to choose between his brother and John, and he says I love you, then he is about to make his choice, but before we find out who did it, the screen cuts to black. Then you hear a gunshot and the episode ends….
I’m sorry, I’ll lock myself in the basement now.