Crowd sourcing would be really tricky. It's inherently easier to manipulate, the more traction you got the more resources would be spent on gaming the crowd sourcing system. Look at what those "reputation management" firms are doing these days with sophisticated blackhat SEO and wikipedia astroturfing rings for example.
Some kind of bitcoin-esque system where you bought sponsored positions by doing search engine scoring related number crunching could be interesting though. Since, if you ever matter, you'll have people devoting resources to trying to game your search engine results you need some system to deal with that. Of course it's sooo "out of the box" to suggest a bitcoin inspired solution to things right now ...
Some kind of bitcoin-esque system where you bought sponsored positions by doing search engine scoring related number crunching could be interesting though. Since, if you ever matter, you'll have people devoting resources to trying to game your search engine results you need some system to deal with that. Of course it's sooo "out of the box" to suggest a bitcoin inspired solution to things right now ...