Don't exclude Inter they are only 7 points adrift meaning only need 3 wins considering there are still many matches left the opportunity remains open
It is undeniable that Napoli and Milan continue to compete but only 9 matches have passed something can happen in the future for example a mainstay player is injured
You're right it's only 7 points so it only takes about 3-4 wins but with a note that the team above them didn't win or get a draw in that many matches, there are still a lot of matches, there are still 28 but 7 points behind is quite a lot, and it will be quite difficult to catch up, especially when there are two teams with the same points and both of them can be said to be equally strong because they are unbeaten in the league.
For Napoli they are a fairly strong team in defense, just look at 9 matches they have only conceded 3 goals, in mid-season will start to be a little clear which team can still compete for the title race.
Honestly Juventus and Inter game being that close was a very good thing to see. I rather see big teams fight each other instead of one dominating the other (Liverpool vs united style). I would say there are some more games left, but with nearly 10+ point difference, Napoli and Milan could definitely still lose some games and end up at the front. Right now, they already had like 4 game difference already, even if they lose 3 games while others win 3, they are still ahead, so that means they need to lose points on 4 games that others have to win.
I would say that for now it is not looking likely, I say at least another 10 games where these two will lead, after that if they are getting worse, if the point difference is smaller then we can talk about it, but if the point difference stays after another 10 games? Then we have ourselves a two team fight and everyone else following.