WiFi is about to get a bump up in speed, so the a/c spec. is worth investigating. Wait a while longer and there should be WiMax.
The thing is, keeping up with the newest and fastest wifi standard is hard, because we have a mix of old and new client devices, some only do b even now. Only a few of the devices need a fast connection, and those are stationary - and near a power plug . . .
WIFI networks will throttle down to the speed of the slowest device.