Everyone seems to presume that there is no cost in re-writing a production system ... or even, changing it to use a different release of the language it was written in. This is never the case. "What is said in language-X, stays in language-X," just like your neighborhood bar. So, never think that you will leave a language behind. Make good money from the fact that new people never learned it. In a short while, what is trendy today will be legacy tomorrow. And it will remain in service despite cries that it is all crap and that we should start over. Programming languages are cheap free. Software written in that language is worth millions.