Bounty hunters make good money precisely because few people do it. I think if all the unemployed became bounty hunters, the bounty fee would be very low.
It is already low right now. It is almost not worth it anymore, there is maybe a few bounties worth it. I dont remember when was the last time i got something meaningful out of a bounty campaign.
I don't think more peopke joining campaigns should be a problem if actually all these numerous ICOs that are out there are actually true projects and not scam. The current number of bounties shoukd be able to accommodate increase in the number of bounty participants without affecting existing bounty hunters.