Methinks you are replying to the wrong comment? But for the fun of it, the large three letter mainframe company made an effort to rewrite their COBOL compiler's backend to use the same JIT compiler they have for Java (check slides 5 and 8): https://www.slideshare.net/MarkStoodley/under-the-hood-of-th...

Such a change would be transparent to the end user.. Except for gotchas like not all users have the source code for all of their dependencies. What happens if you want to update your program and you have a dependency on a binary from some vendor who went defunct 35 years ago? You're stuck compiling against whatever artifacts you have so does transpiling to C still work?