Without disagreeing with your point, I do think there's something to be said for the more specialized sites the Internet used to specialize in. Places that foster a sense of community tend to wind up with users who are happy to pitch in when something doesn't look right (or get overrun by spammers if the community isn't able to deal with the issues). I am happy to pull weeds in a community garden in a way I will not at some factory farm. This approach isn't a utopia; people are people and everything is political, but at smaller scales, saying "Well, just start your own [niche] video site" isn't snark, it's a realistic thing and perhaps both sites contribute to the marketplace of ideas. YouTube is the marketplace of the unthinking.