Ahhhhh, I see. You misinterpret (and also skipped over the first half of that sentence, the whole of which read, “My personal opinion is that while I would love it if such a thing happened, I’ll be shocked if it actually does”).
Yes, to be more specific, I would be shocked if the creative team actually works past Moffat’s straight-hero-worship of his own main characters; the general heteronormative bias of the media; the distaste from the Conan Doyle Estate for Holmes being portrayed as gay; and the probable distaste of international sponsors (including one from the US) for characters on shows they support being portrayed as gay, to end up actually going for it and explicitly demonstrating Sherlock and John as a queer couple.
I hope that makes things clearer!