Blekko won't work
There is one other thing in this world that search engines take care of other than advertising. Do that right, and you win a whole load of market share relatively easily.
These Slashtag things aren't a new idea. Just a new name to the tagging system of old. Applying it to a search engine and mashing it with twitter @'s and facebook Likes isn't even that innovative, at least not something we didn't see coming. The fact is Google is too busy trying to take over the social aspect of the internet instead of simply integrating with the existing systems in place. They probably dropped the ball on this one and are starting to look a lot more like Microsoft these days.
People in power with all the information in the world are control freaks. Whuwuldathunkit. News at 11 I guess.