Your claim that they have "destroyed" Idaho wildlife populations made me look into some historical numbers. The following isn't at all conclusive, but here's what I found:
This link shows that elk harvests in Idaho over the last 10 years have been stable-to-increasing. Other ungulates look about the same: no obvious downward trends. Unfortunately this doesn't go prior to 2008, so we don't know what wolves were doing before then. But apparently the hundreds of wolves in Idaho have not caused a decrease in hunting opportunity in the last 10 years. Perhaps if wolf hunting and trapping were not allowed, it would be a different story.
Hunters took more mule deer and fewer white-tailed deer in 2018 compared to 2017, while the elk harvest was similar between the two years -- dropping by less than 2 percent from 2017 to 2018. The 2018 elk harvest was about 15.4 percent above the 10-year average, and the overall deer harvest was...
idfg.idaho.gov
I found this paper showing Idaho elk harvest from the 1940s into the 1980s. As you can see on page 2, it goes up and down a lot - which, given the time period, presumably has nothing to do with wolves. The worst was the late 1970s, where harvest was down to some 5000 animals. If you compare the this to the link above, you'll see that
the last 10 years were better than any period from 1940s to 1980s, despite the presence of hundreds of wolves now (600 - 700 according to most recent Idaho wolf management report).
Note: the paper also says the estimated population of 1981 was 91k. In 1975, 50k. Now, 120k. Now those are just estimates, and it's possible that changing methods of estimation account for much of the difference.
But in any case, I'm not finding any evidence that wolves have "destroyed" Idaho's big game.
Of course, these are state-wide numbers. It is totally possible that elk numbers have dropped in smaller areas where wolves are more prevalent, as has been seen in Yellowstone area. I wouldn't be surprised. If anyone has numbers relevant to that question, do share.
Full disclosure: If introduction does happen in CO, I hope management is handed to the states, for hunting and trapping, as quickly as possible.