I think that would be great from a game play standpoint, but would be a disaster from a TV show standpoint. The way it works now is that it takes several episodes to get to know the individual players, but the viewer can at least identify which tribe he/she is rooting for and that stays consistent for several episodes. But if all the players were all jumbled and there was no consistency in who was competing with/against whom, it would make it extremely difficult for viewers. Think about when they divide the tribe up for a challenge after the Merge. At that point, we generally know all the players pretty well, yet it's still sometimes confusing to figure out who is on what team, since the teams were only chosen moments before the challenge started. Now think about how much more confusing it would be with 8-10 players per team, and not knowing who any of them are.