In my opinion, keeping venemous reptiles already IS an underground hobby, which is leading the way to legislation. The posters on this forum are generally speaking....the elite, the educated, the informed...and for each of you how many idiots are out there?
I'm not an expert but based upon posts here over the 10 years or so I've read this forum I think the majority of venemous keepers are illegally keeping snakes.
It's the people that have had saw-scaled vipers get loose in apartment buildings or a King Cobra that turned up in a neighbors garage (venemoid), a guy found dead by an airport with a sack containing mambas etc., or the naja naja turning up in the bushes of an apt. building....ALL cases I've read about here and I can cite many more like this off the top of my head.
Throw in the OTHER exotics like tigers, pythons etc. getting out and that hasn't helped either.
I think you need some sort of licensing program like FL has so you can distinguish yourself from the general 19 year old with a monacle cobra in a fishtank in his closet....pre-empt an outright ban by having this type of program.
Good luck to all.