The playerbase pretty much self-regulates the immature players out. Most of them find themselves booted from their alliance, war decced, etc. pretty quickly, especially those leading alliances.
The only exceptions are the immature players in neutral alliances (but those kind of players aren't typically very vocal or active, though it does happen), and the trolls who are literally just there to piss people off anyways.
So, combine the fact that it shouldn't change much of anything with the absolute impossibility of implementation and the loss of players who are young but actually know how to play the game properly, and... well, you get a whole lot of nothing.