Are people forgetting that Kakashi would have enormous chakra reserves without the Sharingan? His stamina improved considerably in this War Arc; At one point he was spamming Kamui... Now his chakra wont get drained by the Sharingan. And he would still be able to utilize all the techniques he learned thanks to the Sharingan (copying). He could already use Chidori as a kid, he used the Sharingan to master it to Raikiri. Without the Sharingan, he can still use Raikiri. And Kakashis Raikiri or Lightning Cable would definitely decapitate Kimmimaro, his Lightning cutting power has very big feats.
And since when does it mean you have big chakra reserves if not sick? It would mean his chakra would not be as small, not that it would be necessarily big.
Bone techniques wont kill Hatake Kakashi. Portrayal people, come on..