Will Django, Ruby on Rails, and Node.js replace Java?(quora.com)

http://www.quora.com/Will-Django-Ruby-on-Rails-and-Node-js-take-over-Java-for-backend-web-development-Ive-noticed-a-lot-of-startups-using-one-of-the-three-new-languages-but-I-also-still-see-a-lot-of-other-startups-and-well-established-companies-building-their-backend-in-Java-Whats-the-future-language-of-choice