I (mostly) agree:
Starting with Java 6 it’s “in the box” there also. To me, this makes it the likely winner, by a wide margin, for a dynamic language to be used at Java shops or inside Java projects. Being “in the box” is a powerful advantage, one which the many other contenders will have a hard time overcoming.
JavasScript uses curly braces, like the last few Big Languages.
However, there are a few reasons why I only “mostly” agree: