ASCII is still used by older systems also. A modern mainframe won't be using only EBCDIC. If regulations change then system upgrades will be needed to cope with

ASCII is still used by older systems also. A modern mainframe won't be using only EBCDIC. If regulations change then system upgrades will be needed to cope with that changing environment. But that involves spending money to do them of course. EBCDIC exists for compatibility with systems much older than ASCII. I don't like EBCDIC much, but it has valid reasons to exist. It's not like it would be a good choice for new development, nor would even big blue advocate something not Unicode related now I'd imagine. Times change and we need to change with the times.