In my simplified view, I think we need to do something about the fact that you cannot build an application today that will not be obsolete in 6 months (at best). And by obsolete, we're not talking about obsolete like a COBOL application. We're talking about relying entirely on frameworks/libraries that may literally no longer exist. Think about an angular 1.x application 5 years from now.

If you're building an application that will take a non-trivial amount of time to build and will have a lifetime of years, what technologies would you pick? How do you train your team members? What is your strategy for maintaining it into the future?

If someone built a webapp 10 years ago, it would be php, rails, asp.net, java, etc. And you can find someone who would (possibly reluctantly) get in there and do something with it. But what about the app built using 20 npm libs. What do they do in 10 years?