Is everything going to break?

[-silencer-]

Yes they would be popular, but let me play devil's advocate here.

Ask yourself why haven't they done world pvp servers yet with no battlegrounds or arenas? It's been suggested a thousand times so why are we not seeing that yet? It's because it doesn't make sense to create a pvp server that would have a different set of rules. It wouldn't be the same game. That would be a totally different game wouldn't it? Where would pvp gear come from, instance drops or faction rep?

But wait! What about PVE gear? Wouldn't those be important to? It's hard enough just trying to have a balancing act with this world they've created, and it would be extremely tough to have a different server with a different set of rules. I'm not saying it'll never happen, but this has been suggested many times and there is very little chance of them implementing it in the near future.

The point would be to go back to playing the game without PvP gear - removal of battlegrounds/arenas/pvp-vendors. There wouldn't need to be a different set of rules - just remove the ways you can access PvP-only content from the server-side and just allow world PvP to happen. Like how it used to be before Bliz implemented battlegrounds. Many people have suggested it, but Bliz doesn't want to do anything to reduce PvP - they encourage it to try to make their game competitive with other games' (better) PvP systems.