Does this spell doom for ad agencies? My theory is that advertising agencies will eventually go the way of travel agencies. Big ad agencies will still exist,

Does this spell doom for ad agencies? My theory is that advertising agencies will eventually go the way of travel agencies. Big ad agencies will still exist, but they'll be forced to downsize as they face stiffer competition from the sort of decentralized indie distribution methods that make crowdsourcing work so efficiently and effectively. Look at what 99designs.com and crowdspring.com do for graphic designers, and apply that to the advertising industry; it would be fairly easy to set up a site that crowdsources advertising and rewards the actual producers with a larger share of the advertising company's advertising dollar budget. Perhaps a question of when more than if.