React, Flux, GraphQL, Hack, HHVM...? All of this and more!
Over five years ago some argued that Facebook and HipHop would make PHP a viable development option for the Enterprise. That did not happen - at least not directly. Many enterprises run Drupal and other PHP tools, but not in core mission critical tasks.
SaaS platforms like Salesforce and Yammer have enabled other platforms to sneak in, but not take over the back office. While PHP is a stable platform with plenty of life in it, it won't be replacing many of the proprietary large core applications like SAP. When you've been building a system for decades and your business is it, in the travel industry for example, the risk of switching and amount of integration work to be done is simply overwhelming.
Since the rise of Open Source and Corporate IT as a big business the development world has been split into two:
In restaurant terms these are analogous to your local Joe's burger joint and McDonalds. The small shop can move much faster and try different ideas, but it can't really own them. So the large corporations can (and will) take the good ideas into use on a large scale and will eat you alive. The small business is forced to innovate continuously - Joe must invent something new. Now, compare this to the rise and fall of Agile.
Stereotypically putting it the hackers and enthusiasts do it for the love of the sport, while the industrial developers do it only for the money. In reality software development is such a creative industry that to even get into the field you've been interested in what you're doing - at some point in time.
Guaranteed good times ahead for the Enterprise developers and Hackers alike!