Here's some stats for you, along with what I have personally seen. Minnesota has lots of deer, but the bulk of the population is in the southern 2/3rds of the state and in the expanding urban areas where there are few or zero wolves. In the big woods of NE MN, we have the poorest habitat and an estimate of 1.2 to 2.4 deer per square mile (MN DNR numbers). Two years ago, I saw two different wolves (one black, one white), and my partner saw a pack of 13 wolves. He actually had a wolf tag then, and watched the pack across a clear-cut for quite a while before taking his shot and missing. I have read some estimates that a wolf will take a deer a week, but the MN DNR claims an average of 15 deer a year per wolf is more accurate. So, my math is 15 wolves X 15 deer = 225 deer. Divide that by a high estimate of 2.4 deer per square mile = 93.75 square miles of zero deer. At a likely more accurate estimate of 1.2 deer per square mile ( after two killer winters; damn that global warming), and the numbers are 187.5 square miles of decimated deer. Now, I have accounted for 15 wolves, and the low estimates (by the USFS) are 2,400. I'll let you do the math. We do have a few remaining moose up here, and the wolves seem to have no trouble filling their larder with them. There have been extensive studies on our moose decline, and there is a perfect storm leading to their demise, but the number one mortality cause on collared adult moose is predators (not my opinion, but the MN DNRs study). We have scads of black bears too, so that is part of the predator equation.
I do like this statistic best of all; 90% of life is half mental. (Yogi Berra).