Im going to go with the in 50 years if you cant code on some level you will be seen as mildly illiterate. Coding will be core to nearly all jobs. There will still be people writing software as software engineers, but around the edges it will be specialists in a discipline writing code to extend the core software to do what they need.
Really, its just taking how many people use excel and growing that up. With technical improvements like simpler to code languages, more predictable API expectations (that is they all tend to work the same as a convention), and general maturity of software as a idea (its not old by any standard). Along with social expectations of what you need to be able to do. Today its use excel, a generation or 2 it will be basic coding.
If you're saying some jobs that today require "Excel" will require "Excel with VBA", sure. But I'm skeptical that programming will become some sort of new literacy. It seems to me that programming has narrower applicability than, say, high school math. Still, most non-programmers seem to forget their high school math, and they get by just fine in careers where numeracy would be useful from time to time, but is just not essential. No one considers them illiterate.
Really, its just taking how many people use excel and growing that up. With technical improvements like simpler to code languages, more predictable API expectations (that is they all tend to work the same as a convention), and general maturity of software as a idea (its not old by any standard). Along with social expectations of what you need to be able to do. Today its use excel, a generation or 2 it will be basic coding.