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.
as long as there is still an ICO, the bounty will still remain, after all it cuts the cost of a project by involving the masses to promote it to the world. the point is that the campaign bounty will never end.