The issue I have with that is then these middle-men buyers would step in like they do for NFL and concert tickets, buying up all/most supply almost immediately

The issue I have with that is then these middle-men buyers would step in like they do for NFL and concert tickets, buying up all/most supply almost immediately when it becomes available for any reasonably popular flight. Then they charge double the price, and there's not much one could do other than pay double or not fly.