There is an absolutely enormous amount of Java out there.
That's what is being claimed above, and what some in the Java community were claiming in the 90s. Also, probably some in the Javascript community these days.
But it's never happened. If there was the One True Language to rule them all, then Lisp, C++ or Haskell would have done it by now.
The point with Java is that even though it was targeting the C/C++ crowd specifically, and it became widely popular, did not cause C/C++ to die.
Again, who is claiming this? Can you link me?
If you want to argue with some several post up, please go several posts up. If you want to argue against me, than please do so on the merits of what I said.
The remaining 20% are stuff like device drivers or high performance libraries that are easier to write in C or C++, or legacy MFC applications.
Also if you look at operating systems like Android, Google makes it very explicit that you need a very good reason to down into the NDK dungeons, to the point that the set of allowed libraries only cover the use cases of 3D graphics and bringing native libraries into Android.
Likewise when Android Things was still called Brillo, the plan was to re-write the Android Framework in C++, instead they ended up bringing ART into Brillo.
Anyway, I was around for this kind of talk when Java was new and shiny, and there were people in the Java community claiming that Java was the future for programming, and any languages in the future would target the JVM or be phased out. That didn't happen, even though Java did well for itself.
What's really telling is that Java didn't replace C/C++, despite all the hype back then. Those two languages remain widely used.