This is the kind of stuff that even a newbie search engine developer knows is important and should be able to handle. Google's mess is Google's mess but it seems to want the web to fix it.
I'm thinking that, going forward, Google might be looking at ways of targeting specific classes of transgressions, the way it did with the above-the-fold algo, to allow Google to maintain incremental granular control of its AI feeback mechanisms... and perhaps in some cases also to allow webmasters inclined to clean up their acts to do so.
Creating seed sets of sites that fit certain profiles is one way of doing this. As I read some of the new reviewer guidelines, that struck me as an approach Google might be taking.