As long as new projects and coins enter the cryptocurrency world, as well as this forum exists, Bounty programs will run. These new projects and old projects which wish to refine their strategies need the help of bounty hunters to spread the awareness across all over the globe.
I think as long as there are still many coin projects, during that time the bounty will still exist, the coin project will not be famous or investors will be known if there is no bounty campaign, because the Bounty campaign is the best way of promotion in my opinion.