Take note of what's happened in Australia.
Way too ambitious project to give 93% FTTH, results so far = massively behind schedule, probably will go over budget, copper/coax ripped up to make it more economical (but less competition).
So that's probably going to get cancelled now and they might get a FTTC network by 2019!
Compare that to the UK, where already 50% of the country can get FTTC with the next 40% coming in the next 2 or 3 years, with FTTPoD for anyone that really wants FTTH.
As Andrew rightly points out, the potential of GFast to give ~1gig speeds over copper is still there too.
BT definitely made the right choice.