I think you missunderstand the core idea of the Oricon DZ. It is there so that PvP players have something to do when they are waiting for a queue to pop - 1) Dueling itself 2)Talking to each other, etc.
The area itself is great, it has LoS, big map, tricky places, just what a dueling area needs to have.
Voss is good as well, but once again, you probably didn't get it - Voss loading screen is x10 times longer than Oricon's.
There are 3 Sanctuary zones that both factions have access to in a game - Oricon(Fast loading screen), Nar Shaddaa(Slow loading screen), Voss(Slow loading screen). Oricon Sanctuary area provides not only a good map like Voss, but also has a very fast loading sreen.
Hosting a DZ somewhere on Quesh, lets say, wouldnt provide a quality experience for Dueling and PvPers, since duels would always get interrupted(gankers, members of opposing faction standing nearby), therefore Oricon is best.
Oricon dueling place is already populated and there is no better alternative. As simple as that.
Good job