There is definitely some degree of executive decision their management could make but it would shred one of the two leads careers. This kind of hard call is why you're boss, so it says something about someone when they don't make this call (although we don't know the full story here, this situation happens enough in general).

The post I was replying to was asking why an individual lead engineer in this scenario would do this. They have reasons to fight and no reason to concede. Their bosses have every reason to, at minimum, get both sides to "hug it out" so why haven't they?

Or move everything to a microservices architecture and use the best suited language for each subsystem. It would force both camps to engineer for composability and open service apis. My tupence.

I have a friend in SF who works at Uber and writes Go there. He said they're using it for a lot of things internally.

If you are choosing a whole new language why not one of the JVM ones.

It is faster and more scalable than Go plus it has a usable debugger.