I think you unintentionally (or maybe intentionally) make a good point here. Regardless of language, re-writing your entire code base is almost always a bad id

I think you unintentionally (or maybe intentionally) make a good point here. Regardless of language, re-writing your entire code base is almost always a bad idea. If you have 100,000 lines of PHP, it's probably going to stay that way. If you were motivated properly, you could start to migrate things over to language 'X' slowly, but even then the benefit may not outweigh the cost.