Not sure data security will impact the SaaS growing trend. But it will definitely require SaaS to take it into account in their services.
They are used to, and for the most part, willing to trust their tech people to do what is right.
Is Facebook usage down? Gmail? LinkedIn? Twitter? I doubt any of those SaaS services are hurting as a result of the NSA scandal, and those are some of the ones that were specifically mentioned as rich data sources for the g-men.
Most of the companies I've worked in over the past 15 years or so are driven Number One by tight deadlines. Anything that makes those deadlines easier to hit, is a welcomed part of the project. Member privacy and data security have not been priorities. Sure, they are important if you can do it, but not as important as hitting that deadline.
We need rapid deployment and flexible configurations for everything. The fast pace just keeps getting faster.
We've seen a rise in VM's, pre-staged servers, appliances, then AWS provisioning, and other infrastructure technology because rapid deployment and flexible configurations are paramount.
SaaS is even better, you don't have to mess with infrastructure at all.
Faster, and faster if you can.
Why? Because someone is responsible for it at the end of the day and they don't want any data protection and security audits to show them up. That's the only reason.
The stories about the NSA breaking into foreign companies for economics reasons got less traction then the consumer social networks because they were less relevant to most of the public, but they are far more relevant to the people making operational decisions in non-US organisations that compete with US companies. For example, how many big Brazilian companies are going to trust Google Docs now that we know that Brazilian companies were spied on by the NSA to steal corporate secrets to aid American companies interests? For those organisations the risks are not theoretical ones about LOVEINT, personal privacy or a slippery slope into fascism. The risks are real and current and those companies are confirmed targets which the US will use any tactic to undermine. Non-American corporations are the targeted enemies of the NSA, and thus the targeted enemies of Amazon, Google and all the other US SaaS providers. For non-US corporations to use those services would be like Obama hosting his email with the North Korean government.