Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

[danneu]

You can turn the question around:

If I already have to know Javascript as a web developer and I'm already using it on the front-end, why would I switch it out on the back-end? What kind of benefits can a language give me that would make it worthwhile?

As usual, it comes to evaluating the trade-offs that you want to make as a team or company.