Hell, I have shirts older than the language it's written in.
In 20 years, I might not even be able to find a working compiler to build it, after the shiny-object crowd moves on to something else.
You know what I'll still be able to decrypt? An ASCII-armored, GPG encrypted, TAR archive.
Personally, I am not interested in the latest evolutionary improvements on file formats. Evolution produces a lot of interesting things; most of them are dead ends. What I want is the cockroach of file formats. The coelacanth.