It is a major bummer, but people are always going to carry on going to those sites.
It's a shame NRW have taken this stance as there are certain places I can think of (the choke dam in Parc Mine for one) that would only really be visited by cavers. With the CAL agreement, our community would have no issues in reporting any change in it's condition back to NRW. We can no longer do that as a consequence of their new decision without admitting to trespassing.
It'll be bye bye Llanrwst if the collapse on Level 3 gives way

There must be a few miles of backed up water behind it