> But if you want to run a system for a decade and a half without ever needing changes, stick to POSIX. You can't have your fossils and eat them too.

… and test before making major system upgrades. For most users this won't be arriving until the next major distribution release and it seems unlikely that this will be the only visible change in such a move. If it's that big a deal, you should have a test environment, change management, dedicated admins, etc.