Sounds like you're talking about WiMax. I was briefly on WiMax in Bellevue, WA, but the service sucked, not sure if it was the tech itself or their infrastructure...
I had the EVO 4G on WiMax, had amazing speed, especially near the highways before anybody else did. Also made for a great hand warmer.
The point is that 5g may provide the product that most people want when they want fiber; have less additional infrastructure cost, and the wireless penetration doesn't matter if we consider a base station -- or a physical install (as required by fiber or coax)