I'd like to see a BG with a system similar ro the one GW2 has. You equip one PvP item that gives you all your stats. You can pick weapons, but all stats are from the PvP item you equip in a special slot. There would be different "builds" like tank, damage, healer, dot-master, brawler etc. Zos would make these different builds. You still pick your own skills.
It should not replace the current BGs but simply be an option for people who want to play BGs 100% for the gameplay. It would also allow zos some good balanced data on class balance, where they can see how different classes perform with the different builds.