Yes, you could still get the sharingan, from a dead Uchiha. As far as we seen Tobi has a collection of Sharingan safe to say came from all the dead Uchihas on the night of the massacre. It's safe to assume, if you take the eye from a dead Uchiha, who has a deactivated Sharingan it will activates once taken out and put into someone else.no not tht i meant as in like for instance if sasuke dies right now without his the shringan active can somehow still get his sharingan eye even though his sharingan is not active