No, if we don't win against inter at home it's pointless to discuss scudetto race
I'd go a step further: if we do not win our next 4 matches, while all our rivals lose points on at least one of these 4 matches (Milan on at least 2), then we won't have much to look for in the last 5 rounds.
Juventus: Salernitana (H), Inter (H), Cagliari (A), Bologna (H)
to win 12 pts
Milan: Cagliari (A), Bologna (H), Torino (A), Genoa (H)
to win at most 8 pts
Inter: Fiorentina (H), Juventus (A), Verona (H), Spezia (A)
to win at most 9 pts
Napoli: Udinese (H), Atalanta (A), Fiorentina (H), Roma (H)
to win at most 10 pts
Then the standings will look like this:
Milan 71
Napoli 70
Inter 68 (1 match less)
Juventus 68
Then in the last 5 rounds we wait for them to slip, while they'll all be within reach.