If you are already in the industry, and part of the 90+% unwashed masses, then you already know this. If you are a student or hobbyist who hasn't clued into this reality yet, then there's no need for "language-choice anxiety". Play with whatever you want to play with, and once you graduate you should have no problem transferring that knowledge to whatever language your first real job actually pays you for (e.g. Java, Python, C#, etc).