Agreed, but it's a very big if that I haven't seen in practice much. By January, 50% of major codebases that I've worked on will no longer be running.

Something that I'm working on for my day job is essentially 32 years old though (been through a couple of big upgrades along the way) and that's how it should be, unless the underlying technology would be better off being replaced (like a COBOL or Fortran codebase).