The Median Ringer I expect we could do such a survey again if there was the will. I think it was Hayley in Truro who recently quoted the "If you can count it you can manage it" maxim. There is a temptation to think there is no point doing such a survey because we know what it will tell us, but it would also provide a benchmark against which to measure progress if there was a will to change.
Some associations have done such surveys recently. I know Kent did one, and the results were worse than they expected - worse as in the level of ringing was less than had been believed. Maybe if Phil Barnes is reading he could comment.
This sort of survey needs to get to the places that surveys don't reach. People would need to take responsibility for answering on behalf of towers which might not answer, along with some process for making sure towers were not covered twice. It could be done at the branch/district level. It could easily collect all the data online.
As we (Roger and I in particular on behalf of the CC) are currently working on an HLF bid which will look to take ringing to new audiences, this sort of starting point research would be very valuable.