"During the G.FAST trials, researchers achieved downstream speeds of around 800Mbps over a 19m length of copper"
Oh good. So they're going to fit new distribution boxes every 20 metres? If you're going to run fibre from the cabinet to within 20 metres of a property just take it to the damn door!
The tech could be useful in very dense urban areas where there are relatively many customers within 66metres of each street cabinet, where squeezing those speeds out of existing copper is cheap and provides adequate bandwidth. But for the rest of suburbia and the country, just run the damn fibre already. We want it and thieves don't. It's the only realistic long term solution.