Google Search Wiki threatens SEO industry

Goggle has recently added increased 'search result personalisation' in the form of "Search Wiki" to its Engine. A registered Google Account holder can now vote up and down their search results the quality of pages. In theory of course this provides a significant threat to the traditional Search Engine Optimisation industry. Where clients now pay for efforts taken to get increased traffic through the exposure of 'higher listings' in Google, a registered user can downgrade those efforts or even delete your website from the results served to them. This mirrors advertising removal or behaviourial targetting direct online advertising models.
This raises a number of questions:
1/ Is this level of 'personalised customisation' just an initiative by Google to increase the loyalty of its current, market dominating, user base?
2/ Is it the start of a push to bring a behavioural targetting element to Google Adwords advertisers?
3/ Is this a piece of functionality aimed to increase the uptake of Google Account usage as this increases Google's ability to promote trialling of their other software?
4/ AND MOST interestingly I feel, is this a test bed of user data gathering that helps Google further eliminate Search Spam from its listings? If so, then this release of the functionality could be a forerunner to when Google incorporates this user 'voting' data alongside its measure of inbound links (PageRank) to help contribute to the algorithm's own decision making. Could Google's greatest coup be to have their Users doing manual site evaluation work on their behalf. If so, then with 85-95% market share they would truly merit Pied Piper of Hamlyn status.
I will leave readers to ponder this, as yet unknown longterm motivation. Please feel free to comment...

