Strange that nobody's mentioned scala yet. Clearly it has its detractors, it seems like a credible candidate to displace Java. It also has more traction than

Strange that nobody's mentioned scala yet. Clearly it has its detractors, it seems like a credible candidate to displace Java. It also has more traction than a number of these languages, and more importantly there's a huge number of java based developers and organizations who are under pressure to improve productivity and can adopt it incrementally. It seems to me to have fewer barriers to becoming a major language than most of the other contenders.