Bounty programs will continue to run until digital currencies are accepted worldwide, it is a job given to people like us who want to earn free tokens by promoting their product. I think that it will continue for many years and bounty programs are very popular to most country.
This is somehow true until crypto is accepted wordwide then bounty will continue to surg high. If there is new innovation and new system to deliver people will just promote their icos thru bounty program. It's an easy way to promote their business to people worldwide.