Perhaps I'm being naive, but I don't think there are any application that ubiquitous gigabit to the home (or even to the phone) will enable alone.

Imagine for example streamed, 8K VR - meaning two individual 8k streams. Even that would only take 100-200mbps download speed, latency would be the real bottleneck and that's limited by the speed of light.

What things can a human experience that can be digitized but require continuous 1gbps to stream? I can't think of any.