I think dueling would add a lot to this game. It would open up an opportunity for PVE players to experience PVP if they are intimidated by the arena. How awesome would it be if we had some dueling going on right outside of Rev's Toll while waiting for a queue to pop? I think alot more people would get into PVP if dueling was implemented. I've often wondered why SE has decided not to include dueling.
Personally I think they did not want dueling in the game because it would allow us to dissect the numbers behind morale among other things, it seems they want to keep these numbers murky and inaccessible as to prevent the usual min /max frenzy that happens in these competitive environments. Anyway just my rant. SE please consider implementing dueling.