From what I understand tournaments are probably going to be a team agaisnt the game and whiver team does the 'best' job of completeing the quest wins the tournament. That sounds like it would work, but my biggest question with that would be how to stop cheating? I would hope its not an issue in most groups but the higher level the competition the more this could be an issue. If none of your opponents are at the same table as you, what's to stop you from cheating? Having a judge watching every table doesn't sound feasable.
Its also possible to have a team that really doesn't understand the rules very well and may play with some kind of inadvertant 'house rule' that makes the game much easier for them.
How could you police this kind of thing with no opponent at your table?