Would definitely fill a niche for the few of us, but Sales is Glocks top priority.
The .22 Glock was heavily requested and thus it was born.
There's a lot of.. distaste for the .40 lately. Some gun store people look at you weird when you ask for one, for some reason.
Would I take one? No idea if i'd go out of my way to buy a single stack Glock .40, but if I felt it concealed that much better then probably I would.