diegoliber

Client-side is gone on most languages. While there's still native mobile apps (and some rare desktop apps), the only language available on the client-side for the web is javascript or languages that can be transpiled to javascript. Flash, cold fusion and other stuff are gone. It's not a "Java is dead" thing.

Go is a good language for developing middleware and automation tools, but it's not, at any rate, a replacement for Object-Oriented languages. Java, C#, Python, Ruby etc are much more suited to business-oriented apps, data science and so on.

There are many uggly things on Go language that can be considered nice features for system programming. Even though, if you go too much on the low-level (such as for operating system, drivers or embedded devices) it's still a issue to use go instead of a more hardcore systems language such as C++ or C. It is, at most, a niche language today. And probably will stay this way unless it goes into a major redesign.

Better to talk about Rust or Kotlin, which are languages that have much more potential and can be a real threat to the dominant languages/platforms today. But right now, they are too unknown to be taken in consideration just as many other good languages that never came to be.