The race for title will be clearer after Champions League goes to its knock out rounds and if Inter Milan continue to exists in Champions League that time. They will have to spend part of their focus on Champions League. Juventus, oppositely, will only play in Serie A and they will completely focus on it that is big difference compares to Inter Milan.
This race can have participation of AC Milan too if they can not go to next rounds of Champions League. They currently don't have too good position in their Champions League group. If AC Milan will no longer play at Champions League, they will focus more on Serie A and can challenge both Inter Milan and Juventus for Scudetto.
I think it is clear enough that Inter Milan will go to the next round in UCL. In group D, Inter Milan and Real Sociedad are leading the table with the same points. Their points are quite far from other teams, it seems almost impossible for Salzburg or Benfica to overtake them. Group D already have 2 teams for knock out round.
We don't know if AC Milan can qualify for the next round or not. The point gaps among the teams in group F are quite small, their positions can change in the final match. But even if AC Milan only focus in Serie A, I'm not sure AC Milan can compete for the title this season. Their performance looks declining so much, they are not in a good condition for joining the title race.