Yes you are right. I can't see any other team in the fight for the top spot or the Scudetto other than Inter Milan and Napoli for now.
Maybe there will be a fight between Milan, Juventus and Atalanta for the next positions. But not for the Scudetto.
For the upcoming season I will trust Inter Milan more than Napoli and maybe Napoli will not be able to challenge Inter Milan with the expected competition.
Inter Milan, Napoli and Juventus are for me the three top contenders for the scudetto this season, Atalanta looks far secondary in this contention, the season have not kicked in fully but this is obvious that these three have good preparation on ground except that Juventus is very inconsistent which I do not know if they have fixed. Amongst them all Inter is my favourite and I hope to see them lift the scudetto.