If I have a code base of over a few thousands lines (yes, even when that small), changing the language is just a dumb thing to do. It requires a complete rewrit

If I have a code base of over a few thousands lines (yes, even when that small), changing the language is just a dumb thing to do. It requires a complete rewrite, while changing a language that your team has experience in for one it doesn't. And of course, the usual rewrite problems also apply: killing a fully battle-tested system in favor of one that has not even seen a strong discussion... And all that because one new hire couldn't get to grips with the fact that the organization didn't use his favorite language.