Whales and dolphins are under no threat whatsoever here in Oz. Dolphins in particular swim off the coast in schools of hundreds, if not thousands. Their numbers have increased exponentially since the yellowfin and bluefin tuna which competed for their food source were wiped out. And the fast sharks like makos that used to prey on them are very much reduced in numbers, too.
There's only one solution. Managed hunting. A ballot for a thousand dolphin tags would be a good start. High protein renewable resource, and all that. And I'll bet it would be popular, too. Sinking home the steel and watching the rope snake over the gunwale would be a hell of a lot more exciting than sitting up a tree waiting for a buck to come off a cornfield. :)