As a professional wedding photographer, I'm in the camp where this issue is bugging the HELL out of me in single shot mode. Black suits, reception venues... it's a freakin nightmare!
I don't see how it can be difficult to resolve with regard to the exposure. If it were such an issue, then how does the 5D2, and pretty much every camera before it not suffer from the same?
As mentioned earlier, the point should light up as soon as the button is pressed half way, and blink black for a fraction of a second to get exposure. Just like every other camera before it.
I also find it curious that 7D shooters were never bothered by this. To me that says that hardly any professionals use the 7D.