End-to-end and more robust encryption and security is essential
Even if we didn't have the sigint agencies to worry about, we would need better security of all kinds (encryption, traffic analysis and monitoring, device features, firmware/software design, user education), because various black hats seem to be ripping off the personal data of thousands or millions of users at a time.
However, the sigint agencies activities just make this more vital. They are basically in a state of somewhat limited cyberwarfare with the tech industry. I mean, what else would you call their penetration of security standards, telecoms cables, security-related databases, IT products of most kinds and spoofing of information/online services for phishing ill-defined intelligence targets? The tech industry and IT professionals in your local IT department need to fight back if they are to protect their business and their customers' and users business and information.
So I feel somewhat bad for the former chief of MI6, but he failed to maintain proportionality in the activities of Britain's spooks (Gemalto being a great example), and having scared the Hell out of many techies he is left wondering why they won't cooperate with what he represents.