I think it's too early to draw conclusions. Only after testing within the new eco system will you be able to say anything conclusive about this measure.
A person going to Google and types in 'Nike' is very determined and knows what he or she wants. An ad from a competitor is unlikely to change their mind.
Secondly, the advantage is still with the brands. Competitors are allowed to bid on their brand name, but can't use the name in the ad copy. Which makes it less relevant for the both the end user, as well as Google's quality score.
So click prices will be driven up, that's a given - but will it become a long term strategy? I doubt it will be for big brand name owners, but I'm sure plenty of affiliates will manage to make money out of it.
Btw, I'm not arguing whether or on Google is right on this - just trying to bring a bit of balance to the debate.