Sounds like not "the death of public key encryption" but the golden age of building technical controls into hardware/software which cannot be subverted by the operator, even in the face of a state agent with a gun. Assuming the right tech is developed and deployed, this is going to be far better for everyone in a few years. Yes, it will be shitty for a year or two, but by 2020, if we actually have real technical secu…
A, the old "let's use technology to solve a political issue" idea.
Sadly, it does not work. For one, the government has all the technology available for it too, including dedicated, full-time paid researchers.
Second, they can outlaw any of those things at whim.