This is a touchy subject but the legalization of rhino horn could save their populations. Look at the white rhino in South Africa. Private ranchers saved them and look at what they bring in South Africa! 150,000 US for breeding cows, that is something those rhino ranchers will make sure are around for generations to come. They have a huge value and if they legalize the trade in rhino horn then the white rhino has another renewable resource of which the rancher can utilize. This will mean more value in the animal and more return for the rancher which all of them will expand their operations which will only bring more sustainability to white rhinos. Many of these ranchers are devoting armed forces toward their protection. I believe if the other species were pulled out of their native ranges and privately owned it would put an end to their demise. The examples are all there in history. Species that were pulled into the private sector were saved and these miniscul wild population left in their native states met or are meeting their demise ie northern white rhino, western black rhino, hirola, western giant eland. Many wanted to keep the arabian oryx in their range country and prioritize insitu conservation. Thankfully sheiks pulled out all they could zoos did they same and they collaborated their efforts. Ultimately the private ranchers seized there efforts and grabbed as many as they could from zoo surplus now their population is the only sustainable group.
Agreed that its hard to dance around this subject and economics could be an answer. But even private game ranches in Africa can't stop the poaching. While the answer may seem easy to us, the Chinese and Vietnamese have their own opinions and beliefs. It is their economy that is driving the poaching epidemic. And we just can't go over there and say stop, especially when our own companies are poisoning the water we drink. So if we ever want to be involved with exotic species conservation, we have to be certain that we can maintain assurance populations.