Commenting on the popularity of languages:
In TIOBE index of programming language popularity (based on web searches), Ruby is ranked 18th, down from 11th in April 2014. It fluctuates, but the trend is downward - 14th in November 2014, 13th in November 2013 and 11th in January 2013. Javascript is still rising.
http://www.tiobe.com/index.php/content/paperinfo/tpci/index....
It is supported by overall job trends (vs those for ycombinator-backed startups and github popularity)
http://www.ryan-williams.net/hacker-news-hiring-trends/2015/...
http://www.indeed.com/jobtrends?q=Ruby%2C+Rails%2C+javascrip...