At this point Kakashi just needs to die fighting Tobi. Gai already made the statement that he seemed to be near his chakra limit from using Kamui too much. Kakashi should be fairly blind in his sharingan eye by now anyway, since he's used his MS at least as much as Itachi did. Hell he started bleeding from it last chapter. So using it up in at the climax of the fight and dying afterwards seems fitting.
After that, we could get a chapter of him dying and meeting up with Rin and Obito in the afterlife, and some dramatic farewells from him. Kishi will probably fuck it all up it, and just fill the chapter with a boat load of cliche speeches. I think we all know what they'll be.
Naruto: Kakashi sensei was always late...but on time when you needed him.
Gai: Farewell my greatest rival. Our record will always be tied. (kinda feel bad for cheating a few times though.)
Hachibi/Bee: When you get to heaven, where the angels soar and the cool wind blows, turn those bitches out, and make them your ho's.