Here's a thought on the whole 'the update ruined my rankings and business' theme of thoughts and posts...
If the rankings appear to be (from the data Google collects) better on a whole (maybe not for some specific searches) why should they have to tell people to improve their sites so they can rank again?
Wouldn't (shouldn't) that have been the responsibility of the site owners the whole time and aren't the ones (mainly) benefiting those who did (meaning spending time improving their sites or presenting better, more unique information or something 'better' than others did)?
So, we have a group of people who think Google should announce or tell or inform webmasters it's time to improve your sites in some way to continue to rank because they want to show what they think are better results based on the data they have for their visitors... Yeah, there are some sites that maybe got 'wrongly' replaced, but if the data they have shows the results are better for their visitors, what's that say about the missing sites?
They obviously weren't the best according to the data collected, so who's responsibility should it have been to improve the level of those sites so Google would not feel the need to make a change?
If the sites presented previously really were the best, then the numbers they look at would probably have reflected that and they would have reverted the change as they have with some in the past, but they didn't which means IMO it's the responsibility of the site owners to increase the level of their sites...
I lost traffic on one of mine, but sales are up, page views are up, time on site is up, and I really can't complain, because it's obvious to me people are finding what they are looking for better now than they were before, even though I would love the traffic I had before... My site was not the right site to show for some of the queries it used to get clicks for, because the traffic that dropped is the < 5 seconds, 1 page view traffic.
If your model is rank and let 'em click AdSense, then you might want to rethink your strategy, because the more Google gets the results right and the less people click on the AdSense on your site the more of the advertising budget is available for Google.com, and unfortunately for those who have built their idea of a viable of business around AdSense when the click budget stays on Google.com rather than being used on your site Google makes a higher percentage of that budget, because they don't have to share with you...
Sounds like good business for them to improve the results and replace as many AdSense serving sites with actual 'answers' as they can to me personally, because then the advertising budget can be spent directly on Google.com rather than them trying to help you pay your bills through capitalization on a wrong result in their SERPs.
If they presented the results people were looking for in the SERPs people wouldn't need to click your AdSense link would they? I highly doubt it... Which means the AdSense budget is spent where? Not on you any more seems to be the correct answer to me.