It is not only Juventus that is a threat, there are so many others like Ac milan, inter milan, Lazio and even Atalanta, the level of competition in the seria a is very high, and it has been that way in the last 3 seasons. But even if there are many threats to Napoli for the scudetto, Napoli are in a very comfortable position, they have 41 points, and the closest team to them being Ac milan has only 33 points, it is a good advantage that Napoli has over the other teams and i don't feel they will lose their current position.