It appears to me that the new revelations about the PRISM program are likely to hurt US commerce over time. If I'm a buyer at a non-US company and I'm contemplating putting my data on Amazon's cloud, using Google Docs, buying a Cisco router, even installing Microsoft Windows on my PCs, I now have to assume that the US company I want to do business with is in bed with the NSA. I have to assume that my enterprise data, my employee's personal data, etc, may be compromised by this new equipment or software. The company's denials clearly mean nothing (since the government has now confirmed PRISM, thereby making liars of them all). For all foreigners, you have to assume that anything you share on Facebook, send in a Gmail, say on a Skype call, etc, could be inspected by US intelligence.
In the short term, this will likely have little effect, since people will have limited choice, and it will take a while for the culture to shift. But in every internal debate about whether to use the American solution or some other homegrown option, this information is going to put a finger on the scale. Foreign governments are now going to have excellent reasons to promote and protect their homegrown software and equipment industries, since they know they can trust them. It will take years or even decades for this to play out, but "Made in America", or at least "Designed in California", just took a massive hit to the brand.