Google has mentioned they're working on the content farm problem. I would expect them to make some moves faster that are smarter than banning content farm X while partnering with content farm Y. Likely algorithmically, coz that's how they roll.
For all of the recent noise that Google has been making about fixing this problem, the number of gamed search results in their index is still insanely high. Take plant diseases for example...every time I've made a search for some specific problem related to my houseplants, the results are so loaded with content-farm crap that I have to go at least a page or two in to get to reliable sources of information.
We're not even talking about relevant webspam from plant stores or online merchants...just eHow garbage, which is poorly regurgitated from the other sources that come lower in the results.
Although, perhaps we underestimate the scale they deal with. Plus, manually removing sites that are not clearly evil but on the border may become a PR nightmare.
The irony is that is Google's own AdSense program is the incentive for the creation of airburger web sites, which otherwise have no reason to exist.