In my opinion, it should have ended like this: The screen suddenly going black after Naruto is knocked out from his fight against Sasuke and he wakes up in a real life hospital, realizing that everything that he had been through since the beginning was just a dream, as he had been in a coma all that time. That, or everything that happened was in the mind of a mentally unstable man or kid in an asylum.
You must be registered for see images