As far as I can tell, it's not about odds. It's more about variety and differentiating between huge battles and smaller battles. Previously, every battle, big or small, looked the same, it was more a matter of how long it took. With this scaling, there will be a noticeable difference in the 'feel' of different battles.
On the new official NA servers, I've played near 60 v 60 strat battles, and NA 1 fills up with over 100 players fairly regularly. In neither case do I experience much lag. The servers themselves seem like they could handle larger battles. The limiting factor I think is the player's computer. I have to tone down on the number of corpses and ragdolls, but otherwise it's all good.
I think we should try larger battles.