And probably never. In addition to the reasons that may have already been mentioned, FTTH provides a non-shared path to each house, while any wireless technology is almost by definition going to be shared by many people. I've seen some people talk about using multiple frequencies or modulation schemes to squeeze more bits out of wireless, but there is no reason the same things would not apply to fiber as well. Not to mention things like weather, interference, etc. Wireless might provide some type of stopgap or interim solution, but the end game is going to be fiber to each home.