If this turns out to be long term (and I am not thinking it will - just brainstorming), is there a chance that the overhaul actually gave Google more algorithm-pertinent information than they could detect before?
As in: I send a low-resolution photo image to my friend. They're happy; they like it. Then I work hard to take a duplicate high-resolution image and send it to my friend. The friend sees something in the second image that wasn't visible in the first, and gets upset, and never calls me again.
In the case of the CSS overhaul, is it possible Google is more sensitive to CSS signals than HTML signals for "spam" triggers?
And if that's the case, chances are there IS an end to this - for example, if it takes a while for Google to put the site through the various algo filters. Or (worst case scenario) if it goes on longterm and it gets to the point that you submit your site for reconsideration.