I can say there has been a shift since ES6 (Now called ES2015), in which we now (in plain ol' ES6/ES7/etc) have the syntactically sugar and features in that was only available with something like CoffeeScript.
As with any Javascript language (like CoffeeScript) a transpilation step is required in order to transpile it to ES5 (or ES6). This may never go away though, because ES6, ES7, ES* will continue to implement features before all of the browser vendors natively support them. So, we will likely continue to need something like Babel.
So, I believe some are already coming back to writing plain JS, but there's always going to be other options, like TypeScript.