I can imagine that U.S. companies wouldn't do anything, but European companies would be much more motivated for transition. As we speak, the top managers in Europe do try to find an alternative and everybody likes the easy way out. At the moment, baring some other potential compromising evidence, Apple would be such a way was it not on the Prism slide. Transitioning to big the powerful non-compromised Apple would be probably valued as less pain than transitioning to your in-company-made Linux distribution.