You need to change your display name as soon as possible or risk having your account deleted.
Mainframes have been around for a long time. They will stick around for a long time as well. There is so much cobol code everywhere and people need programmers to maintain it. Its difficult to move away from the ol reliable as well.
Incidentally, I gave up on mainframes in part because I could make more money doing PC applications programming than I could doing mainframe systems programming. Which used to pay much better than mainframe applications programming. I don't guarantee the same to be true in all times and all places, however.
I like a good income, but not so much that I'm willing to move out of town or take a really awful job just to pocket some extra cash.