As an IT major, I decided not to go to any grad school

[ss20ts]

they aren't used in business either

most big systems still run on cobol               
you still have many financial companies using python instead of 3                  
nobody's going to dump a system that has been working for years just because something else in new and popular

Plenty of big systems aren't running on Cobol. My husband hasn't used Cobol in over 15 years. He would find a new career rather than go back to Cobol. His company is in the process of moving to a cloud based system on AWS with Python. He's been working with SQL for over a decade now. He's looking forward to moving onto Python.