Let's put this to bed early. There will be no Victoria 2 POP system in EU4. The Victoria 2 POP database is huge undertaking to create in an era when countires did censuses, it is even harder when you don't have these. A POP database is also CPU intensive to use and a lot of work to code (increasing the odds of slow downs and bugs). So we would really need a pretty amazing reason to use one in EU4. We haven't thought up with one so we are not going to do it.