If they were ripe for disruption and it was easy to do this disrupting just be returning better search results, and returning better search results was an easily doable thing then I suppose all the other functioning businesses that have a stake in web search would already be doing that disrupting.
Search disrupted catalogs. What will disrupt search?
If they became important sources of information outside technically competent people I suppose we would end up with a bunch of Awesome lists of Content Farms!
Search disrupted catalogs. What will disrupt search?