Real Madrid will continue racing for La Liga title with Barcelona that must be careful with Lamine Yamal and this young player's lifestyle. Yamal seems to step in similar ways of Neymar, Ballotelli and some Brazilian players and if he continues like this, his player career will be very short. We knew how Ronaldinho, Adriano, Balloteli have very short time at top of European and world football.
With professional players, lack of professionality can be biggest issue that damages their career earlier than expected.
Real Madrid will indeed be one of Barcelona's rivals for the title next season, but they need to anticipate the defense. If several key players are unavailable, Real Madrid's defense will be very weak. Xabi Alonso's task is certainly not easy, as there are still several weaknesses that have not been addressed, and if not properly prepared, Real Madrid will struggle to compete next season.
I don't look too much into Lamine Yamal's personal life because although he is close to several people who have failed, he should understand the impact of his actions. If his career is not properly maintained after it has been built, this will continue to happen until Lamine Yamal will eventually follow in the footsteps of the names you mentioned.