Well I always wondered if you needed 2 uchiha for the kid to have the sharingan. Can you have like half uchiha kids who have maybe one eyed sharingan? What happens if sasuke and say hinata get together? Does the kid have both sharingan and byakugan working at the same time? RIDICULOUS.
Anyway, if you don't need 2 uchiha to carry on the clan, then certainly the clan isn't dead. Besides I'm sure that somewhere in the world, maybe on a mountain someplace there is a sharingan user we don't know about.
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