I'm just trying to see where Node and Golang are on their popularity and hype curve, comparing them with the popularity enjoyed by Java in the late 90's. Also, I'm trying to decide between Node and Golang to put some serious effort to learn. What are your thoughts?

However, I don't expect any of these two new languages to have the same rapid growth Java had. It just started in 1996 and there was an enterprise ecosystem built around it by 1998 (EJB, Servlets, JDBC) and ruled for about 2 decades already.