What sets the modern era apart from the rest of human history is that Marlinspike's ideas are radical yet commonplace at the same time. He's in the company of people like Thomas Jefferson who advocated the idea of
permanent revolution, or that the rebellion against unjust government would never end. It would keep on happening through the ballot box. That is what democracy is. It is continuous small, non-violent revolutions against the government.
This is quite different from almost every prior form of social system in human history and it's arguably the single largest idea which has contributed to lifting humanity out of poverty, war, oppression and misery (the scientific method is a very close competitor for that distinction, but without permanent revolution most scientists probably would have been burned at the stake or ignored).
There will always be people - the powerful, the entrenched, and maybe just the ill-informed, cowardly or intellectually lazy - who are terrified by the notion of permanent revolution, so to them it's radical. (One wonders what camp this writer falls in, because usually journalists are well aware of this stuff, for many it's their raison d'etre. Has this one taken a civics class? Do they believe Jefferson was arguing for anarchy? If so have they looked up the definition of that word in a dictionary?)
But despite the fears of those people, permanent revolution is the secret sauce modern society is built upon. Western civilization has a long line of prominent thinkers and historical examples which has led to this way of organizing ourselves. It is precious and it is still new and if we lose it we might never get it back again.
Anyway, I like the argument that Signal's CEO makes here [1], which is that for virtually all of human history, privacy has been the default. The Constitution was written before the invention of the telegram. At that point in history you could always go into a room alone with someone else, have a conversation, and be reasonably assured that the conversation was private. Bugs and wires didn't exist. Wiretapping didn't exist, surveillance didn't exist unless you had a third human physically present.
This makes privacy akin to a natural right, something we have always had, that we are entitled to by nature of being human. I'm of the view that the US needs a Constitutional amendment to protect it, and if any government seeks to deny it we should give them a reminder of what permanent revolution is and show them how it works.
[1] https://www.youtube.com/watch?v=E--bVV_eQR0