- people who will never earn more than this off youtube, but aren't motivated by earning money.
- people who are currently earning less than this, and are motivated by money but are on a trajectory to quickly exceed 1000 subscribers. they'll be minimally affected.
- people who are currently earning less than $100/yr, but are motivated by money and are unlikely to exceed 1000 subscribers anytime soon. If they're actively working to grow their channel but can't break 1000 subscribers, losing them is probably for the best.
I don't see how this is going to really harm youtube's content pool.