Why should they? It works for many cases and has mountains of apps, tooling, libraries, hardware support and whatnot. It takes decades for the new OS/ecosystem to mature.
https://www.microfocus.com/en-us/products/visual-cobol/overv...
I surely have, hence why I have gone back to Windows, where the focus is C++ and .NET, macOS where the focus is Objective-C and Swift (UNIX is there for historical reasons only), Android where the focus are Java/Kotlin and C++ (with Linux kernel being an implementation detail).
> Windows, where the focus is C++ and .NET,
Microsoft is huge organization they have multiple focuses. You seem to be mixing the kernel/userland layer and making very weird argument against UNIX(that nobody uses).
I am not familiar with COBOL is there any effort to improve COBOL?
Please, get out of the GNU cult and check out what BSD's are doing in C.
Apparently people don't have any issue hanging to an OS about the same age as COBOL.