What I'm working on though is more about taking the core of existing spreadsheets and building powerful integrations on top of it. Like in the sibling comments, building a webapp, or something else. I really think this has huge potential.
JS is nice because all you need to write it is a text editor and a web browser, both of which just about all computers have. I had an entry-level job that involved a computer once and automated a lot of the painful stuff with JS - I bet that if more people knew JS, more people would do the same.
I don't know if that'd be a good business proposition, but I think it could be a good on-ramp.