While this sort of plan might appeal to the pioneer and bushcraft spirit, if nothing else, the reality is that for most people, this is just planning to fail.
There are a few problems with falling into what I call the Living Off the Land Fallacy. For starters, while the DNR isn't likely going to be enforcing fair hunting rules, you aren't going to be the only goofball out there with a rifle or bow. If you've ever gone hunting with someone brand new to it, you know just how frustrating, even dangerous, it can be. They don't know how to be quiet. They want to take shots that are risky at best. They just don't know what the heck they are doing, right? Now, multiply that times a thousand as there are going to be a ton of other folks, just like that, out there looking for their own dinners.
On top of that, it won't take long before tens of thousands of house pets are going to turn feral and be competing with you for the small game. Granted, some folks might look at that as just being an addition of potential targets for lunch. Even so, competition is going to be fierce. It won't take long before even the ubiquitous squirrel is scarce.
What about fishing? Okay, not a bad plan but do you really think you're going to be the only Babe Winkelman out there wetting a line? Plus, likely as not you're also going to have at least a small segment of the population who will sit on the sidelines and wait for someone to reel in a good sized bass, then take it from them by hook or by crook.