I'll Believe It When I See It
IMHO I reckon that no matter how fast any wireless technology can be, its reliability will always be an issue. Also, the faster it gets the more difficult it becomes to get it to work through objects (like walls), I think that might be down to something called physics.
When I want to know that my connection will work 99.999% of the time, I'll use a hardwire thanks, and wouldn't touch wireless with a barge pole.