> Polyglot is the future, and people are already adapting

Yes, right. I like how you can read into the future. Let's see what happens 10-20 years from now, things tend to change. But even if we look at how things are now, plenty of places still commit to 1-2 languages (in fact if you're a small shop it's pretty crazy to try anything else).

It depends heavily on the problem you're solving. A few jobs back I was in a small shop and we were all regularly bouncing between Java, C, Ruby, JS, Perl, Python... Go crept in round the edges too. We wouldn't have been able to deliver without the full set just because of what we had to interface with. It's more than doable as long as the culture is "learn the necessary skills".

> plenty of places still commit to 1-2 languages

That might be true, but it didn't mean they will commit to ONE language for forever. Even governmental agency's code gets rewritten in newer languages eventually:

https://aws.amazon.com/blogs/apn/automated-refactoring-of-a-...

C, Java, Javascript, Ruby, PHP, Python, all these languages are 30-50 years old. I don't see any of them fading away the coming 20 years from now (you might argue about Ruby since it's much smaller, but it has a very strong community keeping it moving). You could bet your career on any of these and I'm pretty sure you will be fine 20 years from now.

I am a polyglot outside of work, across many fields beyond just tech. Wordpress themes, managed networking, and home automation have been my latest tech projects. (Let’s make light switches less reliable!)

Since I’ve run Linux servers at every job I’ve had, I’m trying to get my toe into devops at my current employer. Getting all of our application into Docker has been fun. (Why does everyone run shit as root in a container!? Dropping permissions isn’t difficult!!!)

That's easy to say, but for small teams and startups it's difficult to achieve.