[BjoernKW]

"Ever" is a long time but if by that you mean "in our lifetime" then - barring the singularity and everyone technically living forever - no, JavaScript probably won't ever go away.

JavaScript, especially in its most recent iterations, is a decent language with useful properties (non-blocking; can be used purely functionally and in an object-oriented or procedural manner) and a fast runtime. It's especially suitable to the task it's mostly used for: Web app development.

I can hardly think of any programming language that'd be more appropriate in that context right now.

The only real downside is that JavaScript isn't a typed language and there are options like TypeScript that while perhaps not completely solving that particular problem at least alleviate it to a large extent. Who knows? Maybe, the next version of JavaScript will provide a type system similar to TypeScript, which given the latter's adoption and support by several large companies isn't entirely unlikely.