After watching Inter this season I think the other teams will really need to make a huge progress this summer. 
Because the gap is just enormous now. Maybe you will say Napoli were also like this in the prior season and failed later on. However Spalletti left the team which caused big problems to start for Napoli right after.
There isn't such thing for Inter. They are moving on with Simone Inzaghi. I believe they have the best squad in the league at the same time. In this situation it wouldn't be seeing them winning a back-to-back title unless we see some reaction from another team.
If the team is provided with transfers that can fill the necessary deficiencies, Inter can easily win the championship again, but if they send important players for the team and cannot fill these gaps, the championship next year may be a dream. That's why the most important period of this year will be the summer transfer period for Inter. Inter must take very important steps in this transfer period. Because the gap is just enormous now. Maybe you will say Napoli were also like this in the prior season and failed later on. However Spalletti left the team which caused big problems to start for Napoli right after.There isn't such thing for Inter. They are moving on with Simone Inzaghi. I believe they have the best squad in the league at the same time. In this situation it wouldn't be seeing them winning a back-to-back title unless we see some reaction from another team.