Board Thread:Naruto Discussions/@comment-18016240-20160208110013/@comment-681696-20160210175039

Tobirama's plan only needs to last until the Uchiha clan fully integrates into the village, if not for Obito's attack on Konoha then the Uchiha clan would have continued to be live their lives and raise the new generations of Uchiha loyal to Konoha with the old baggage and suspicions fading away as the older generations die out naturally.