1. Not giving the open-pvp players the option to go to a PvP server and forcing them to go to a PvE server is just going to piss them off and make them quit. So what dilution are you talking about when players ragequit?
2. What server community are you talking about when there is already none? What is the difference between a server community that is physically a merger of 3 former servers vs 3 servers sharing the same community? Doesn't make sense.
I love PvP servers and all my 50s are on the PvP server Master Dar'Nala. I have rolled an alt on the Harbinger which is a PVE server and am loving the game due to the MASSIVE population.
There is no world PvP on Master Dar'Nala anyways!