I think Nim is slowly growing in popularity. I suppose that popularity is going to come with exposure. You don't necessarily need a killer app, just a set of libraries that people can use to do a common set of tasks. Data Science, Progressive Web Apps, pick your trendy buzzword.
I picked up Nim after looking for something small to code with at home, something that didn't need a whack a mole IDE, and that I had to spend all day installing. I have actually started using Nim for shit in work now. Shit perhaps being the optimal word. For testing it has what I need though. Command line; Windows Scripts; a bit of math and chart, I could in theory use it for the Webdriver but Puppeteer is there.
