The only time that I think a PvP arena would be any good would be at a competition. We have no need to have them scattered around the map when it's meant to be faction wars. Faction wars is meant to what it says, factions having wars with each other. But coming back to the competition idea I don't think that you should have high end equipment like in the video. I think it should be a full set of iron armour and a diamond sword with a bit of food. I don't know what you think but to me this is a good idea