I suspected there was going to be a mass exodus. NSA basically killed cloud-computing. I don't think it will come back soon. And while on the subject, consider selling your Microsoft stock. How many enterprise customers will choose Microsoft products again after 2013?
I don't think the current disgust will last too long. A lot of people will move, at some point they'll realize the grass isn't all that much greener on the other side.
There is a definite activation energy required for such a move and I'm sure that the NSA debacle provided just that for a fairly large number of parties but in the very long term the difference will be small. (In the short term it will be quite significant, at least as long as this issue is on the front-burner in the media).
The response to things like this is usually an impulse with a strong attenuation over time. It'll never quite become 0 but it will get close to 0 in a fairly short time.
The reason why right now we are seeing all this movement is because Glenn Greenwald specifically is doing an extremely good job of keeping the focus on this subject. Mainstream media would normally have completely passed an issue like this by as too technical and not enough human interest to spend a lot of time on (both of those are negatives in a news cycle that thrives on eyeballs and associated advertising).
The longer this story is kept in the public eye the bigger the fall-out will be. For now, I'm very impressed with how they are managing this, considering the adversary.