Saying "coding" is like it's learning medical billing or something. Which is probably more useful for most people.
Coding, or rather programming, is not a new literacy in the sense that exposure should be forced. Programming tools are free and there are free programming tutorial websites. That should more than suffice for today's equivalent of most of us here who did whatever we could to get our hands on a PC, type in programs to learn, taking courses by choice, and enjoying it.
We programmers are not more or less literate than other acquired skills, on that skill alone. And those who don't program are not more or less literate than us lacking that skill.
Those who want to program will have already jumped right in as soon as they were ready. There is freer access than ever now. I'm sure we'll have fine new generations of programmers to join us.