My personal opinion is that their numbers be curtailed drastically and the range land leased for raising cattle. Wild horses are not good for anything other than eating grass and viewing by enviros that go ooh and ah.
Slaughterhouses should be reopened and the meat be allowed to be shipped to Europe. Those slaughterhouses were not only for wild horses but for all horses. It wouldn’t be a large industry but it would be a money making business for several of them and it would be a way to get rid of excess horses.