That's actually an interesting question. I would love to see some data on whether it really is impossible for the average person to live off the land if they wanted to.
An adjacent question is whether there are too many people on the planet for that to be an option anymore even if it were legal.
Probably way, way over the line. Population sizes exploded after the agricultural revolution. I wouldn't be surprised if the maximum is like 0.1-1% of the current population. If we're talking about strictly eating what's available without any cultivation at all, nature is really inefficient at providing for us.
An adjacent question is whether there are too many people on the planet for that to be an option anymore even if it were legal.