I'm sure there are facilities in NA or Europe in need of new bloodlines. One such place is Homosassa Springs. They have a an eldery male hippo named Lou and once he passes they could replace him with a pair of Columbian hippos! Other zoos could have some as well. I understand the culling may be necessary but it'd be nice to give them a new home with zoos. If they decided to cull all of them, they should save some sperm samples from the males for use in AI for the captive populations so the hippos can still have a potential use after death.