Yeah for now especially with their performance this season I don't think they will be a threat to other team next season because they don't have what it takes now, however is very obvious that they will find it difficult to cope on the champions League because their are so many clubs there that's doing very well more than Juventus so if they failed to invest on more players I'm afraid they may not even be able to qualify from their group stage.
If you look at what Thiago Motta has shown with Bologna last season, Thiago Motta should also be able to do the same thing with Juventus.
The team with its new coach for next season will be different, so what happened last season cannot be any benchmark for what happens next season so I think it is unfair for us to compare or predict what happened because of last season.
Personally, I am quite optimistic about Juventus next season and now we just have to wait for Juventus management to recruit new players and the management should be able to recruit quality players according to coach Thiago Motta's wishes.
they are certainly already investing in the market as you can see there have already been some very important purchases some market rumors say that Bayern Munich is interested in buying Chiesa, they may just be rumors but surely that player at Juventus doesn't want to stay surely Motta will find one team suited to his game are investing a lot and will certainly be able to return to what they once were