"Even if not,as far as i know ,the "youtube economy" i.e. people who earn full time salary on you tube is quite small. So i'm a bit pessimistic about it filling the economy."

The point is that money making projects will be so rare, that people would have no choice but to put money into projects that have the remotest chance making money. Funds will fund millions/billions of projects on the basis of finding one superstar project. They would diversified on a massive scale. This would be better than letting money flounder.

That or a kickstarter model where people simply give money to projects that interests them.