"But it's possible, brother!" Hashirama exclaimed. "And not just among us children. He's an adult, and he's got the same dream! He could talk to the other Uchiha! Other clans too..."

Hashirama was a trusting boy, to the point that he was actually defending Itachi mere hours after leaping away in fear of him. But he had the eyes, and he hadn't used them to do anything but see. And his friend wasn't scared of him... So maybe...

"It's not unrealizable. It's gonna happen one day. You'll see!!