You are over-generalizing, and more to the point - you are clearly neither a Forrst or Dribbble user. The difference in the quality of the content is very noticeable. To put it into a more sensible coordinate system, Dribble is a moderated mailing list, and Forrst is an unmoderated one. Or, better analogy perhaps would be hackers vs. script kiddies - do you know of many hangouts of former that tolerate (leave alone embrace) latter? Me neither.

History has always proven my statements to be right.

Changing human behavior in such a fundamental way is highly unlikely to happen from some technical limits put up on a website.

I don't need to be a part of those sites to know this.