What good will it do?
Doesn't the patriot act allow the us to order any company with a presence there to hand over any data whereever it's held? Microsoft seems to be in an ongoing battle about something like that (which isn't even a 'real' patriot act case, if I remembe correctly, because nobody would know about it if it was).
So when Safe Harbour is axed, american companies will simply start losing their customers (the ones that have their brains in gear, that is...), whether they store their data outside the us or not.