I do wonder how sustainable it is, previously these aggregators did lots of things at Google's request, cleaning the noise out and laying everything out in nice data-annotations. More fool them, it turns out.
Google cross-references them all, builds their 'own' data and drives them all out of business.
It's pretty scary how much of the digital high streets Google has ruthlessly stolen from us all, and imposing a huge tax for doing pretty much sod all.
I occasionally wonder if anyone would every have the balls to nationalise the search engine, it should be a public utility, not infested with ads covering 90% of the first page as it's become. I'm even semi-serious :)
At the very least I wouldn't mind a nice ruling that Google are now deceptively calling themselves a search engine, and that they can now only show one ad per 10 real results per page.