[XorNot]

Except for the part where you need an huge array of transmitters with backbone bandwidth equal or greater the number of devices they may be serving simultaneously.

In which case those companies just start doing fiber installs to wireless stations, not houses, at roughly the same density.

[cincinnatus]

Or just piggyback an antenna into the hardware otherwise installed at each consumer location. There was a theory almost a decade ago that Google would do something like that on top of all the 'dark fiber' it was buying up at the time.