Depay should have chosen a club that would give him more places in the squad. I don't know why he didn't want to leave Barcelona. because Juventus is not a small club that will be in arrears of salary. if he stays at Barcelona, maybe Depay will get very few opportunities to enter the main squad.
This reminds me of Bale at Real Madrid.
Whilst Depay's situation at Barcelona might not go as bad or grow to the level of Bale's at Real Madrid, i still think he will struggle to break into the Barcelona team with all the signings that they have made, Depay was somewhat their star man last season after Lionel Messi left and the club were in a pretty bad shape, the club looks to be in a better shape now, and they have acquired quality star players, thus Depay is definitely set to lose his prominence. Depay prolly wants to see what his situation is like from now till January, and if he isn't happy at all, i believe he will push for an exit in January.