On our estate all phone lines are buried without ducting, I'm not even sure that there is ducting between the chambers, but there may be. Installing FTTP would be expensive as it would require digging up the whole estate and right up to peoples houses. A lot of people will not want their gardens and driveways digging up, it wouldn't bother me as I ran in a hopefully suitable conduit when I had our extension built and they only need to go across grass:-)
However if G.Fast, XG.Fast or this Phantom system was used they'd only have to install fibre to the DP/chambers and then use 1 or 2 of the existing lines to each house, I have a single buried armoured cable (I know this because it was uncovered when the extension was built) with two pairs in it, and my DP chamber is just across the road about 30 meters away.
If the nodes were close enough I'd expect the speeds available would satisfy the majority well into the next decade, with the others paying for much cheaper than today (if it were available) FTTPod because the fibre runs much closer.