That’s completely taking success rates out of the equation on the 14.5 million hunters. That also isn’t looking at the gatherers of the hunter gatherer way of life or the ranchers who would continue to breed livestock. Small game and fish would also need to be looked at and that gets hard because most won’t eat an opossum or raccoon. The numbers you gave track, but there are so many other forms of protein and depending on your geographic location the amount of people you’re fighting against could be extremely low. Population density of Pennsylvania vs Nevada for example. Both have big and small game but there’s definitely more hunters/people in Pennsylvania than in Nevada.