Just remember that Orochimaru did not have the "will of fire" so the leaf would likely be a much different place than the one we know and love. It would most likely be similar to how you view the sound village, but on steroids. I would love to see the Orochimaru vs Obito during the nine tails attack. Also Orochimaru's plans would have been accelerated as Hokage, as he would have dealt with the uchiha clan differently than Hiruzen would have, likely using them as host bodies and for experiments.