Thought the Sharingan can see through chakra output and all that. That way, since Kakashi is already a skilled lightning jutsu user, and since he can see the flow of the Raikage's chakra, it wouldn't be impossible for it to be copied via sharingan. The only reason I hope he DOESN"T learn it is because it would give Sasuke another powerup
Sasuke already experienced on a battlefield Raikage's lightning shield, so he can pop up with it any time now (knowing Kishi...)
A true good idea would be for Naruto to understand a bit more about chakra shields and create his own controlled fashion.
HAHAHA. Kakashi could barely use 1 Lightning Beast and a Single Lightning clone without depleting 25-35% of his chakra so no, we should not expect to see him copying the Rai-man's Lightning shield anytime close. If Kakashi was to use an ability like that he'd probably be dead in less than a minute. Sasuke on the other hand, with his massive chakra reserve and his already developed basic version of the lightning shield, stands way more of a better chance of learning it. As cool as it looks though Sasuke's will have to learn how to induce his lightning chakra internally rather than just be able to discharge it because Sasuke's definition of channeling his lightning through his own body is stabbing himself with a Chidori, lol. I'd hate to say it but if there's anyone who would be able to use the Rai-man's ability it would be sasuke, that'll be overkill though so I dont see Kishi doing that. Maybe in a time skip when he's Kakashi's age or something.
On a completely random, yet slightly relevant, note I really want to play the new Infamous game, lol.
"He is now declaring his words to the WORLD!"