When JS stops reimplementing Unix tools or stuff from the Bell ATT labs from before you were born, I'd start getting worried. The fundamentals are important, when you get into anything more complex than slapping crud apps together. Witness the monstrosities birthed by JS "programmers" that have never slung pointers, or been acquainted with tree operations, or think MVC was birthed with Web 2.0.
LOL... of course you can build crap in any platform/language. On the flip side, look at what Walmart and Netflix have accomplished with JS, which is a far cry from the monstrosities bemoaned. It's not all simple, because it's a relatively easy and flexible language to start with.