I grew up in north eastern Saskatchewan a long, long time ago, in a land with a large population of prairie chicken (sharptail grouse) and partridge (grouse.) Conditions were made to order for the birds; mixed farming, lots of uncultivated land with pot hole sloughs and best of all, the grain cut with a binder, then thrashed with an immobile thrasher and leaving large straw stacks for chickens to winter in. Plus, any type of hawk or owl was fair game, to be shot anytime a person wanted to.
As a teenager I attended a formal fish and game club meeting, where the key speaker was a game warden. He encouraged every one to always carry a firearm in the vehicle with them, so they could shoot any predator they saw. His words were that if we didn't keep the hawks and owls under control we would lose our game bird populations.
In later years game biologists have told me that once a population of anything reaches a certain low, it will never come back.
Under present conditions where the predators are the darlings of the land and highly protected, with huge fines for any interference with them, it seems to me that sharptail grouse may just have reached low of no return.