It was an unsaid option, the obvious option that we all should know Itachi would never take because of the repercussions it would have. Itachi also threatened to reveal all the secrets of the Leaf if Danzo ever harmed Sasuke, because Itachi knows that Danzo constantly goes beyond Hiruzen's back to do things (the Uchiha Massacre is a prime example, as it was shown that Hiruzen didn't want to do anything violent, but Danzo persuaded Itachi into doing it). Exactly, he knew Itachi would never start a war, but it was still an option of his. The Uchiha weren't willing to negotiate, Danzo ****ed up the plans to use KA, Shisui killed himself, and the coup was getting nearer. Also, Tobi said this
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"Itachi is dead, nothing stands in my way now."
This clearly infers that Itachi made him stay away from Konoha. We all know Tobi was the mastermind for Akatsuki, but he was not the entire organization.