Not to be too macabre, but we need to transfer the knowledge while the people who have it are still alive, can remember and can teach others to pick up the torch. And, let us call it was it is, of those remain and still have the desire to make the effort to transfer that knowledge.
It is easy to look back on y2k and think well that wasn't a big deal, but the only reason it wasn't is because people tirelessly worked to stop it. It is a testament to their success.
Regarding y2k Robert Bemer tried to warn people in 1971, with 29 years left to go. And, Peter de Jager published his attention-getting article "Doomsday 2000," in 1993 (in Computerworld), with a mere 7 years left which finally put the fire under everyone's ass. Keep in mind, there were still many original COBOL programmers and mainframe experts left to talk to at that time. And, there was a lot less code to change back then than there is now.
Voting tabulation, insurance, utilities, administrative systems, banking, ATMs, travel, healthcare, social security, point of sale, IRS, pension funds, TACTICAL NUKES, hotel bookings and payroll programs. More than 800 billion lines of COBOL code in production systems in daily use. For better or worse, it is the very bedrock of our modern society.
If you want to replace it with something that you want to maintain instead, that's fine too but we're running out of time.
"Danger, Will Robinson! DANGER!" https://www.youtube.com/watch?v=OWwOJlOI1nU
"Listen the nothing will be here any minute. I will just sit here and let it take me away too. They look... like... big... strong hands.... Don't they?" https://youtu.be/symP4QT7wLU?feature=shared&t=24