Why? What influence do authors have on where their books get sold? Naively, my guess would be "none". As a reader, I am certainly unconcerned with the opinion of authors on where I should buy my books...
The publishers will be pissed, but Amazon remains a key market, so they will get over it.
Amazon has been trying to sell authors on the concept of cutting out publishers entirely, and just jumping on board with Kindle self-publishing.
Given the reaction by authors to this move, I don't think many would be receptive to this idea any more - Amazon has shown that it's willing to bend its suppliers over a barrel and strongarm people in pricing. Given that Kindle self-publishing is still in its infancy, and still has yet to sign a major author willing to ditch a publisher, this recent news hasn't really helped its case any.
The publishers will be pissed, but Amazon remains a key market, so they will get over it.