Honestly, not sure everyone will like it.
make all the lvl 30-60 map pvp zone
This would hurt F2P so much since they'd be grinding and all of a sudden someone with maxed out gear comes in and kills them constantly. This would be such a bad addition in the game unless they make a map and a mode for this to where regardless of gear everyone is on equal grounds on stats. This way team coordination and skills are actually recognized in the mode and gear won't be so unbalanced.
If I remember right WoW has something like this as well, where their "bg" made it so teamwork and skill would be the thing that decides who wins.