A large number of you are saying that Kakashi will never go blind because he had his eye transplanted. Imo, this is completely untrue. There is no clear evidence that what worked for Madara would work for Kakashi. There are some things you can assume from manga chapters that aren't necessarily confirmed, but this is not one of them. Let me explain...
Here is one of the important pages in the explanation of the transfer:
You must be registered for see links
If you read the chapter again, you'll remember that in Madara's case, he was already going blind due to his MS when he transplanted his brothers eyes. Not to mention, his brother also had a MS when his eyes were transferred. The panel says that the exchange can only be done through clansman but Kakashi is a special case because he never had a sharingan to begin with.
Here is my point.....given this explanation, we have to assume that the only way to get an EMS is to have already possessed the MS when you received a transfer of Sharingan eyes. Since Kakashi received Obito's eye before it had the MS, he did not benefit from eternal sight. Since he developed the MS later, he will definitely go blind eventually. He can only obtain EMS if he had another transfer at this point.
There is one thing we can assume that is not confirmed in the text regarding this issue; that if you are going blind from MS and need a transfer, it is not required for the doner's eyes to MS eyes. If a transfer was done where the doner did not possess MS, it is assumed that the user would still retain his full MS abilities and thus have an EMS.
To this end, and old theory of mine is that if indeed a double MS transfer is done, like Madara/Izuna and Itachi/Sasuke, than that new owner would not only retain his old MS abilities, but would also gain those possessed by the doner. Thoughts?
Getting back to the topic, I think I have explained my case why Kakashi will eventually go blind and I also think he is suffering from vision loss in that eye already.