To be honest it doesn't matter. So long as we beat the teams we're expected to beat. If we end up third and Sydney second we're in serious trouble, but that will only happen if we can't get over Hawthorn in two weeks time, in which case we won't deserve to be premiers anyway.
Obviously ideally we will never have to play Sydney in Sydney, but should that happen it's just another challenge and if we play the way we have at times this year it is still a winnable game.
Keep in mind if we do have to play Syderny in Sydney, it won't be at the SCG, making it a 50/50 game.