At this time Javascript's biggest strength is build tools. It may not be as mature as PHP on the server, but there is so much community growth that I don't think it will be long catching up.
It's like saying PHP as a great community, we will catching up JAVA soon.. non sense, as the topic said, I want to use node if there are some killer app that I want to use, like the one I know in other languages. Do you know any like drupal for example (multilingual, workflow, content management system, and more) ?
The fact that there's at least 4 "mainstream" build tools and their popularity changes every 6 months is a sign of an ecosystem with little stability that is no good to build a solid foundation.
On Ruby and Python land, how long has it been since RoR and Django have been the dominant players?
http://codepen.io/BrianDGLS/pen/BoyBGK