you could always email adwords and tell them you are shutting down your campaign due to:
"the adwords campaign we where running in Google was always meant to compliment our listings in google, for some reason or other i can't find my site www.mysite.com anymore in google and can't see any reason why I should continue with this secondary advertising know that our primary listings have gone.
Funny you should say that. I already made up a draft but I haven't sent it because I thought they might visit the sites and ban the rest of my sites which got missed.
My main gist was that whilst we are still profitable, some offices will now close, and it is for those areas I will stop advertising on Adwords. So in actual fact although Adwords revenues will increase short term, I think a lot of entepreneurs will find it hard to manage without the free listings too, and the long term outlook for Google may be worse.