A coach can certainly change everything even without extensive experience, but if he skilled at managing formations and strategies, I think chivu can transform Inter milan into a stronger team. I say this because I've seen xabi alonso successfully transform Leverkusen, and chivu could do the same. But we'll see how well he performs this season.
Furthermore, in Serie A, Several major team, like ac milan, are experiencing a decline in performance. This will certainly benefit Inter and other teams. But inter must work hard, as underestimating their opponents could cost them the title, as they did last season.
We must understand that little by little these coaches will take their course and will bring improvements according to their experiences, I'm not saying that it will all be easy for them, especially for Chivu, taking a Champions League finalist team and trying to win will be very difficult.