It's probably the opposite. Disease killed too many plains indians so the population skyrocketed and then crashed. Their predator wasn't made too strong; it was almost wiped out. When whites show up you could walk on the back of Bison from Canada to Mexico without ever touching the ground. No amount of hunting by whites or indians would bring those numbers down if they were sustainable; they just weren't sustainable.
It's probably the opposite. Disease killed too many plains indians so the population skyrocketed and then crashed. Their predator wasn't made too strong; it was almost wiped out. When whites show up you could walk on the back of Bison from Canada to Mexico without ever touching the ground. No amount of hunting by whites or indians would bring those numbers down if they were sustainable; they just weren't sustainable.