And that's the problem right there. Everyone keeps saying "let us have 1 vs 1 for funsies", but how long is that gonna last? Any content that has little to no rewards behind it get abandoned real quick; I never see anyone play each other in Triple Triad except during tourneys and there's barely anyone doing chocobo races and that's because the rewards behind them pale in comparison to just farming NPCs for MGP at a much faster rate. Duels are going to fall under the same trap and even if they DID give rewards, Square would probably not make them be worth as much as a standard PvP mode to prevent easy farming.