Inter still have several difficult games ahead, so Napoli will have a chance.
With current position, i think the chance for Napoli is a bit difficult. I know Inter just 3 point ahead Napoli, but if Napoli also made another mistake, 3 point will become more far away. Even inter have another big match with another competition schedule, they will start to keep their points gap with Napoli still save. Just few match away, very possible to secured their position.
It will be difficult for Napoli to over take inter in this season, because they displayed some performance that make people to believe that they can manage to end this season in second position. Bologna played Napoli as if they are the one at home, because many teams use home to take advantage of every game to beat their opponent, but Napoli draw at home 1:1 with Bologna for you to know how poor Napoli performance was in that game.
If inter can beat Bayern Munich in the quarter final in the UEFA champion league yesterday, I guess inter will win all their remaining games to lift this trophy.