Gaming with brands its a dangerous thing for google - because they game here industries which are bigger as they are.
Brands do not use ads on their sites.
They even do not need Adwords (notice the "need" instead of "use").
In the "real" (or better "old/established") advertising world, google/adwords/adsense is far away from be the big player as it maybe looks like.
Adwords counted in the advertising business around 2010 still as a not professional tool, i can't see that changed.
No one knows, how the business really works in, let say, 2015 - which is not far away.
How is the impact of mobiles & Ipads then?
What will facebook be able to do?
Amazon? The most underrated player in this game IMHO.
And Ebay is recovering faster as they was going down.
Will the browser force the java supression of ads code? Google can fast
come to a situation like "google chrome - the browser designed to show you
ads". That they found mozilla was and is perhaps their smartest move of
the last 10 years.
IF there comes a trigger which allows brands to kick in ads, lets say for
mobiles, outside the adwords system and the SE - then google has a big,
big problem.
Then their SE are dominated from sites which generate their income
complete outside their traffic/SE system and do not need adwords.
I am far away to be a google hater, but when i would have the chance to
use the 2010 google SE, i would change from the current in a second.