Since there is a lot of diversity in the playstyles of the DayZ playerbase, I think that if possible a fourth server should be added that is for RP.
It would have specific rules of engagement, specifically placed and designed trade routes/highways, more server events, etc.
As I am more creative when it comes to things like this I could design a whole dynamic for players to enjoy and be a part of and I could spend more time mostly managing this server and even possibly be the sole proprietor in case other admins aren't fond of the idea.
And just to make it clear, this would NOT be a PvE server, that's lame. PvP 100% allowed, but in specific areas only for KoS.