1. You didn't answer the question. You said what they wouldn't be doing. What would they be doing that would be making them happier?

2. You didn't answer this question either. What specifically is stopping them from opting out? Who is putting a gun to their head and saying they can't live a hunter-gatherer lifestyle or be a subsistence farmer?

The answer is nothing. People are largely making these choices themselves, because they're better options, for reasons that are obvious to anyone who's read a bit of history.