Bounty campaigns will exist as long as advertising is needed for the development of the community and attracting new customers, I think for bounty hunters there is still a chance to make a profit, only in this market it will take longer.
No, bounty campaigns will keep on existing as long as the owner of the forum allows them but if at some point he changes his mind then you can say goodbye to bounty campaigns so all of those that are depending on them to get money need to look for something else to do so when that happens you do not suffer that much the lost income that you will not get anymore.