well, we have to be honnest and we know that most bounty hunters have a small impact on the coin sale, so it is possible that even on ICO there will be some changes on the method used to evaluate and pay the hunters...
As for IEO, at this point it is a new thing and there is no need for hunters, nevertheless, if the system stays and more projects use it, it will end up being as hard as the ICOs and they will need the hunters for promo...