Who is the publishers worst enemy?

That seams related with the previous post about google digitization program but I'm not sure it is ... it was just started by it ;-)
I think what's happening with Google is not more different than what happened to other business partners in the publishing history. Think about Amazon ... is a good partner but if you talk with somebody working with them they'll love to criticize how the big bad Amazon is eating their profits.
Well ... when you do publishing just for profit you can be sure that Amazon is THE enemy, but if you do it in order to spread knowledge and leave a good life from that occupation may be the perspective will change. That does not imply that Amazon is a candid company ... is just doing it's business like any other retailer.