Well, there's the difference. Maybe demand has collapsed for the kind of people who knew how to tune the Oracle SGA and get their laughable CLI client to behave, but the market for people who structurally understood the best ways to organize, insert and pull data back out is still solid.

Re Oracle and "big 90s names" specifically, there is a lot of it out there. Maybe it never shows up in the code interfaces HNers have to exercise in their day jobs, but the tech, for better or worse, is massively prevalent in the everyday world of transit systems and payroll and payment...ie all the unsexy parts of modern life.