FTTP has been a viable technology for over a decade - e.g. Verizon's FiOS started rolling out in 2005 - which would have been plenty of time to get going and have a very considerable rollout by now. It's not as if BT had to start in 2015.
Unfortunately, in this country we prefer to find excuses to justify mediocrity, even if the excuses don't stack up - and G.Fast is no panacea, as it will need fibre to be run even deeper into the network to be viable, even if not to every home. FTTC hasn't eliminated that, merely allowed for procrastination
Verizon had a good reason for getting FTTP going - they wanted rid of the copper.
From what the public can see Openreach really, really, really like having the copper there. It's a steady earner. If they have made any attempt to negotiate its replacement with Ofcom we've not been privy.
When Verizon started with FTTP there wasn't really a viable alternative. FTTC/N was somewhat in its infancy. Not the case by the time BT belatedly joined the FTTx party, VDSL 2 gave the option to deploy speeds that were 'good enough'.
Not to mention that BT couldn't have made their FTTP rollout much more expensive per home passed or slow per home connected if they tried. Really did completely ignore the lessons learned elsewhere and decide that they knew best, something that they have only in the past months, commencing with the FoD2 trials and culminating in the trials in Haydon Wick, begun to address.