I may be provocative, but I would regard pet keeping as an opportunity to grow an amateur movement contributing to study and conservation of amphibians, not as a threat.
Amphibians are chronically understudied, underfunded and ignored. Enthusiasts could contribute here, a bit in parallel to a community of bird-watchers contributing to protection of birds.
Trapping for pet trade may contribute to decline of some species, but amphibians can be bred in collections in large numbers (e.g. Zagroz newt) and the community can be policed (like e.g. community of bird watchers managed to police itself not to photograph birds at nests). This is not a quick or easy task. But actions like a country banning keeping any reptile pet because of danger to few species is against the spirit of a sane public policy.
