I keep saying this to all the depressed new and old programmers who believe you cannot make money anymore and it’s all over; there are billions of lines of legacy shite running the biggest companies in the world. Not only Cobol and Fortran, but excel/vba, access, fox pro, and, indeed, old php. Companies have to choose, every year, to rewrite or maintain. I do many projects focusing on maintain; example; my last client had a quite to rewrite his systems in some modern crap (next/react) for a little over 8 million usd (that’s the estimate; not a fixed price and of course no guarantees by the consultancy corp quoting it) or, we will keep their ancient php and Java running for 25-50k/mo (few hours work per year to do that with Docker). I have a very low tolerance for rewrites so we go in hard against companies offering them: we make far far more profit than any of them; we run well over 50% with far less risk. Once I discovered containers (chroots in the late 90s and now docker etc), I knew rewriting things is never needed.