It might be my area. Most COBOL infa got replaced or is on life support. But I did happen to see the good stuff once in a while. There’s a reason it was not touched.
A small part of me thinks it might be the place to retire. Working on old code bases.
My last COBOL work was in a bank that replaced COBOL with Java and minicomputers with the indies servers in a misguided effort to modernize. Before that we had five mainframe programmers, after Java we had a dozen more and no one was really sure how many layers that Java onion had. People kept piling abstractions on it in another misguided effort to make it simple.