I don't think that Mourinho will be succesful the next year. This year he went good, a 5th place, a Conference League won (with an incredible lucky), but the next year I don't think that they will improve their game style
and also their position, they will conclude as always between 5th and 7th place. It is a mid field team.
Do you doubt a Mourinho who has won titles with different teams. In his hands, Roma managed to win the title after a long time did not get it. Unlike you, I think if Mourinho was given the freedom to manage Roma and sign the players of his choice, I'm sure Mourinho would bring something extraordinary to Roma.