To paraphrase your own statement, Node makes it easy to develop an increasingly popular type of app, highly concurrent, scalable, realtime streaming application

To paraphrase your own statement, Node makes it easy to develop an increasingly popular type of app, highly concurrent, scalable, realtime streaming applications, in a popular, widely used language, with ease at a level that has not seen before. Really, its the same trajectory as Rails, but targeted at a different problem.