It is definitely very worthwhile to get to the depth of at least one language and one framework, because with the scope of what you'd learn about these ones, yo

It is definitely very worthwhile to get to the depth of at least one language and one framework, because with the scope of what you'd learn about these ones, you will have a frame to more easily understand and learn to use the others, even if you never become expert with the other languages and frameworks you will have to use. On the other hand, since it takes ten years to become expert, you may not want to wait before starting to learn alternatives. But as a newbie, you don't want to switch to other things too early either. You should have written a couple of non trivial programs (eg. a real application) with a language before you switch to another.