By contrast state, county, and even city government are paying $65K - $85K starting going all the way up to $100K at the top end. And these are jobs where you're doing modern development, not COBOL.
People will start learning COBOL as soon as it makes rational sense. As it stands a lot of organizations aren't looking for any COBOL developer, they're looking for CHEAP COBOL developers. It doesn't make sense to learn when you'd lose money for taking those jobs.