Pvp is a ton of fun, but after the time in the wild we lose our armor and cant pvp my suggestion is when you left click a pvp teleportator you will enter but in a different mode(thought you will have to pay 50 rupees). In the following "mode" every kill will give you a little durability to your armor, tools, and weapons. Every time you die in the mode... you lose a little bit durability of your armor, tools, and weapons.
Or just get two sets of armor... I can see this mode getting people pissed, as they might die a lot to players who are better at pvp. Armor in itself is not too hard to get if you play minecraft and get resources, and this seems not very needed. -1 from me.
I have a set of God armor for each server.. It also isn't that hard to repair armor with the xp you get in the wild. -1
How do you have better armor than diamond armor with protection 4 unbreaking 3 thorns 3 (and the boots and helmet enchants)?
Repairing things is easy and 1.8 has made it easier than ever to repair stuff with the super low xp cost compared to before.