For companies who try to keep their tech stacks minimal and employable, and devs who try to develop marketable skills, CoffeeScript would have to offer some very significant perceived advantage for it to enter common usage. It doesn't, so there it is.<p>But this is front-end tech we're talking about, so who knows - maybe everyone will have to know PineappleScript in two years to do web dev. (Side note, I had to do a few googles to find a joke JS transpiled language that didn't actually exist - that should tell you how bad it is).
I had the honor/misfortune of inheriting a coffeescript codebase.
Swiftly rewrote the whole thing in JS, to the great relief of everyone who had ever needed to maintain that code.<p>It was a weird language and deservedly died out