Telcos could have a massive advantage in upstream speed. Sckipio is confident they will deliver an efficient way to switch bandwidth. I want upstream. Jennie does video and we upload terabytes to Amazon's unlimited cloud. My neighbor probably prefers downstream.
This "dynamic time slot allocation" (DTA) demonstrated by Adtran worked over coax. No vectoring is needed because the shielding minimizes any crosstalk. Calix has previously shown G.fast over coax. The engineers are confident they will soon be able to deliver 750 up, 750 down on coax. Their companies have promised that to AT&T, which acquired coax systems with DirecTV.
Vectoring a DTA system in typical telco multi-line binders is much more challenging.