Google moving from CPC to CPA?

This is my go to guy for telecom industry news.  He actually just quit his job as a lead editor for Business 2.0 to blog professionally, and got $10 MM to do it.  But this article is pretty interesting.  I’ve signed up for it and it’s pretty cool.  The proposition is great for Google and advertisers, but they need consumers to sign up.  They won’t get Amazon and EBay to sign on because of pay-pal, but if they can get some major .com’s on board it could take off.  Search marketing from a CPA basis could be interesting.
http://gigaom.com/2006/06/29/why-google-is-doing-checkouts/