Interesting thoughts. How will youtube change our culture?
Sometimes, when I look at youtube, I see it as a collection of the long-running America's Funniest Home Videos. Between the treadmills, the evolution of dance, and more "Weird Al" than I could ever want - it's sometimes difficult to dig down to the deeper issues.
Personally, I see streaming video sites, like youtube but for a specific niche (take education for example) popping up very soon. Perhaps, much like wikipedia has reduced the barrier to entry for encyclopedia-like knowledge - in 10 years or so you'll be able to download for free all of the lectures of a college degree - especially with the introduction of fios (fiberoptic cables allowing speeds up to 10MB/sec). Spending four years at a physical university may become unnecessary (as is already a trend with online courses).