AdWords is a major source of income for google, so they aren't going to risk showing ads that lead to a downed website. People will start to think that adwords stinks, only showing them spam and ads that don't work.
As a result, Google is going to be very cautious, at least for a while, until the spider and everything else realizes that everything is finally functioning properly.
Everything will settle back into place...I just have no idea when :)