This is why enterprise tends to be very conservative and stick to one or two platforms for decades. It's stupid to throw away your investments when your tech du jour ran out of its time.
Makes you wonder if all the people dismissing everything as 'fads' even have jobs. Because I can't imagine anybody hiring someone in IT who is so proud to dismiss any new technologies not on merit but because it is somehow fashionable.
We don't rip off the majestic buildings of Manhattans because they are more than 50 years old. We preserve the buildings that survive the test of time and demolish the ones that don't.
It's the same principle here. The COBOL system that is existing right now is the survivor of brutal business changes in the past 40 years. You don't kill a survivor - you maintain and enhance it.