Depends what you want to do. That's it. Don't obsess about changing too much. Speaking with a colleague, he was asked why he chose mainframe as his career.

Depends what you want to do. That's it. Don't obsess about changing too much. Speaking with a colleague, he was asked why he chose mainframe as his career. "It doesn't change much. COBOL, DB2, CICS, JCL, etc. I can learn them and the applications to a deep level, and not worry about that learning going out of date. That lets me focus on getting deeper and understanding the business applications of why we do what we do."