Definitely. Fanfiction is a great place for exploring such concepts. One reason for these 'more Uchiha survived' fanfictions could be the popularity of the Uchiha clan. Fans love the unique abilities like the Sharingan that the Uchiha possess. By having more of them survive, it allows for deeper exploration of their culture, their relationships with other clans, and how they could contribute to the world of 'Naruto' in different ways. It also gives a chance to rewrite some of the more tragic parts of the original story, making it more hopeful or complex.
Sure. There are quite a few. In these fanfictions, the survival of more Uchiha can lead to all sorts of interesting plot developments. For example, it could change the power dynamics in the Hidden Leaf Village. It might also affect Naruto's own journey, as the Uchiha have a strong connection to the overall story. Maybe there would be new alliances formed or different rivalries emerging with more Uchiha around.
Yes, there are. Some fanfiction authors like to explore alternative storylines where more Uchiha survive. They might create scenarios where certain events are changed, like preventing the Uchiha massacre or finding ways for some Uchiha to escape. These fanfictions can offer unique perspectives on the 'Naruto' universe and the Uchiha clan's role in it.