That's just it. Sooooo many have dove the Ball Room, Blue Grotto, Devil's Den and even Buford Sink without incident, that when we start screaming about the dangers inherent in them we simply sound silly. Why would we want to sound silly? You aren't going to get any of these sites to cut their financial throats and start restricting access either. Perhaps it would be smarter and more doable to accept these exceptions and identify them as such.
A better idea would be to develop an online registry of caves and sinks. Describe the limits for each... OW to here... cavern to here... Only full cave past this point... etc. Take the guess work and the "limit creep" out of these caves. Look at the "do not go further" sign in Blue Spring (Orange City). How many divers don't respect it because it's not really dangerous until you get to the 80 ft depth. We come across as being nannies with limits like that.
Speaking as someone who is not overhead trained in any way but would a system of ratings such as in climbing work? Someone would have to lead and designate the sites though (with the possibility of a site being multiple grades depending on how far you go).
Only issue (as they have as well) is a huge number of different systems that rank things differently.
Something like:
1) OW
2) Cavern clear view of sunlight
3) Cave
Add additional levels to those basics to take account of additional issues:
a) good solid base so virtually no chance of silt out
b) loose silt that may cause minor issues if kicked up
c) very loose silt that will cause blackout conditions but disperses/settle quickly
d) as above but will take a long time to disperse/settle
Add another layer if you want to describe restrictions etc:
1) No restrictions or restrictions that can be done side by side for air share
2) Restrictions that can be done single file but with only enough room for in line air share
3) Restrictions that can only be done single file but are tight and require planning/ gear configuration to suit (ie sidemount)
4) Restrictions that are very difficult and may require gear removal to allow passage.
Using that system it becomes easier to rate a particular place:
An easy ocean swimthrough might be deemed as a 1a1
A cave system such as Eagles nest might be 1a1 at the bowl at the top, 2b2 at the neck and 3d4 at further points.
Just a thought and would probably need a fair bit of work to refine it but would potentially be better than a free for all as it seems to be atm with different agencies deciding on different policies.