From my point of view, JS development can only grow. I'm seeing it in more different places and is our way to go for different projects. Now, as a professional

From my point of view, JS development can only grow. I'm seeing it in more different places and is our way to go for different projects. Now, as a professional, I wouldn't tie myself down to a single stack but be able to work with others because there's lot of stuff written on JEE, .Net and PHP that someone has to maintain and are so different from Node. Also, I don't see other stacks growing as much as Node, like Go or Pyton. And even PHP is that big not because PHP itself but because of Magento, Joomla and all the other PHP based products already out there. On a final note, affirming that a frontend developer can't do backend is simply stupid. And once Node and ES6 confluence it will be even easier.