JS alone will get you nowhere. JS is part of todays web ecosystem. And developing for the web today is so hard, people doing it are either inexperienced and naive or - like me - sort-of specialized/focused in some vertical toolstack like LAMP + Wordpress + Bootstrap or something and never really happy with their results.
The problem is, that you have to know HTML5, CSS3, DOM perhaps some jQuery UI or HTML canvas stuff + UX + responsice webdesign + Typography & Layout + a workable set of backend tools (LAMP or such) to do anything usefull with JS. Which makes the whole thing basically impossible for an "entry level" developer to learn.
I suggest you find a team that has a working development pipeline, uses versioning (far to many webshops don't) and puts out good results and learn by doing.
As for JS in general - there's a lot of academic ragging on JS here, but most of it misses the point about JS entirely:
JS alone is like a mix of Python and Ruby made to look like Java (yeah, I know) and doesn't look very modern. However, what makes JS interesting is the fact that as a platform it is available basically anywhere. JS is todays PC of platforms. A toy, not taken seriously by anyone, but available for cheap/free everywhere. Which is why it is going to win in the long run, just like the toy-technology x86 did, eventually squishing every other architecture like a bug on it's way to total world dominance. In the early eighties, people would've laughed you out of the room for predicting that.
I personally wouldn't be suprised if JS eventually replaces PHP, Java and Co. on the serverside and takes over everything but system development on the clientside within the next decade or two. Be it natively or with languages that cross-compile to JS ... We already have a ton of those. Google is heading for bringing the second half of humanity online, and as far as I can tell, they're succeeding. Which in itself does put JS in a future-safe position.
JS, Browsers and the clientside webstack are a mess, but they are truely cross-platform, open and not controlled by a single entity. Very much like x86.
So no matter what you're doing, getting into JS at a professional level one way or the other isn't the worst thing to do.
My 2 cents.