Importance of Learning Japanese Language

What's your career plan? I've never heard of anyone being rejected for speaking a foreign language.

A lot of people would learn it just for fun. You can't escape learning culture along with language, and with that comes gaining a new perspective on life and values. If you've got a chance, do it, I'd say.

By all means, Guru, see FBM above

I spent 6 years there, loved every minute, but wish I had done so

It depends on your choice of career what kind of career you are selecting. And yes, every language is beneficial so just learn it.