I suspect for 95% of lines all the information is there, just not currently easily accessible.

Chorus/Telecom Wholesale will know things about your neigbours that can help, ie which street feeder your on, and the line stats from the ISAM of those near neighbours that will assist them to get a pretty good handle on what you can expect.

Obviously the above would fall down in more semi Urban areas, but still some level of understanding could be derived that is more certain than current.

All this however would come at a cost, a cost many of us here in GZ would pay, doubt the populus at large would, until they fell in the same hole as the folk on FG.