No, it isn't a waste of time to learn Russian. Russian is a very useful language out in the world, and is useful in doing business and traveling all over Central Asia

And if you get to a high level, you can read Russian literature in its original form.

Since you clearly read and write English and presumably speak it, you've already got a major "practical" language in your linguistic toolkit. And if you enjoy learning and reading (and hopefully speaking) Russian, you should stick with it.

(Note: I edited your question topic list to send it to topics where you'd get good answers.)