Im glad to see the clustering is being looked into, there is nothing worse than searching for something and seeing 15 links in a row from the same domain ( like tripadvisor or other large content heavy sites).
(Downvote if you will but I doubt Google's intentions these days and their earnings are through the roof, even as PPC goes down.)
Eventually. Doesn't mean that Google isn't doing it believing they're controlling the negative effects or doing it "just a bit" this time and a bit more that quarter.
Diversity on Google is largely gone on transactional search, big brands rule both the ads and organic search. This is responsible, IMO, for Google at almost $900/share but will eventually ruin Google. They got too greedy and people will eventually bypass them and go directly to the brands Google promoted for short term cash.