It's going to take a long time for video search to develop.
This relevancy ranking is what I think will be the secret sauce to Googles blog search success.
The big hurdle for video search to overcome has been the dearth of content that people really want to find online. That's starting to change rapidly.
Social search is not one of these things that will take off overnight. It will take a lot of time to build.
There is this natural inclination by big communications giants to want to be the focal point for the user experience, the starting point, the way to search the Web, and not just an instant message or voice communication tool.
Search engine users aren't terribly loyal, so a better or more targeted technology could make headway.