"anyone who has an interest in it in the future" is a very vague term. I'm confident lots of things will happen in crypto centuries after I die, but that's not in my threat model.

Neither do I care about what happens in a couple of centuries. My main worry is that in a somewhat foreseeable future data of electronic communications can be used to construct a model of how a society of interest works to a degree useful enough to attack/control it.

So it isn't necessarily about what I am communicating or to whom I talk but the fact that it seems impossible for society as a whole the hide the details of its functioning.

I viewed pgp/gpg as a tool that could counter this. Convincing people to use it would've been an uphill battle but there would have been a slim chance of succeeding to a useful degree.