Board Thread:Naruto Discussions/@comment-4682609-20140806081616/@comment-1018594-20140813051223

I was just thinking...when Obito said that it might only be temporary...maybe he wasn't necessarily talking about the Sharingan itself? Maybe he was referring to Susanoo, or the right Mangekyo?

It doesn't seem likely that Kakashi would be able to keep up a stabilized Susanoo for as long as Sasuke would, considering he just manifested it literally seconds ago. So maybe that's what Obito's saying won't be permanent.

Or, as I mentioned before, maybe Kakashi's left eye is so used to the Sharingan that it might able to stick around, but his right eye will go back to normal eventually.