I don't know what will happen in the future, but perhaps the current model of advertising (with the help of bounty campaigns) will exist. In any case, ICO is a model for attracting funds for people who have little money. And bounty is a free advertisement.  I see this model very effectively. However, in the future, the requirements for bounty hunters will be strengthened i think. For example, now, bounty hunters have twitter accounts with fake followers, and so the effect from such advertising is very weak. I think the emphasis will be on bloggers, and social campaigns will go to the background.