I agree with you, Motta is a new coach and needs to study the club in other for him to know the team well. Any players that is brought in will need to time to adapt with the club football pattern. There is a lot of work to be done because Motta needs to bring his own game tactics for the players to blend in and that will take some time. I believe that Juventus from next two seasons will be able to win the trophy.
Seria A is consider tough and we understand what it means for elite clubs to fight for the scudetto. It's never consider an easy race but the winning team will always come out stronger than the usual phase. Juventus will do better next season, they just need time to fall back on lane and attain winning as priority.
Thiago Motta is experienced, he was a good player during his prime and have accomplished alot. He is one of the good coaches and we know how tactical his game plans are and executing them shouldn't be a problem for the club.
Many clubs has faced what Juventus is currently into ,what the club needs is more patient with coach to try to fix up things and by providing him with the funds to get the right players this transfer who will help in achieving the desired result. If they do the right thing there's definitely going to be a bounce for Juventus come next season.