Gasperini built up a very attacking Atalanta but in his two first matches with AS Roma, he won minimally with them. This means either he has changed his tactics - that I don't believe he changed, or AS Roma does not have enough good attacking players to play so attacking and score many goals. Another possibility is those players need more time to absorb the tactical philosophy of Gasperini for playing more goal productive.
Scudetto is a very ambitious target and if Napoli could win it last season with Conte, AS Roma can win it this season with Gasperini. Yes, they can but there are many matches till the season ending and AS Roma must work very hard to get Scudetto. If they want to win Scudetto, they must start to think of it now, work for it now as in Scudetto competition, any point drops can decide the title winner.
Well, in as much as the the ambitions of every manager is to win at least one title before the end or at the end of the season, I believe Gasperini should be given the chance to put AS Roma in a good condition before anticipating winning the title, Roma are not anywhere near the class of Inter milan or Napoli in terms of team players and at such shouldn't be expected to start competing for the title but rather should concentrate in building momentum and qualifying for the champions league next season.
Nothing is impossible, but as you mentioned, Roma are far below Inter and Napoli. For now, Juventus, Napoli, Cremonese, and Roma each have 6 points, while Inter lost. As for Roma, they look quite solid to me they’re winning matches by narrow margins, but everything seems calm and controlled. They have a good team and also a quality coach who can achieve a lot, but as you said, the focus should shift to the UCL and fighting for that part of the table.