AS Monaco, Leicester, Atletico Madrid are the examples of why and how the football is changed during the last 5 years.
Teams like us, PSG, City, Napoli (BVB next time) look neeed to respond with a different formula if they want to back in business.
The wind is changing. If you haven't 11 players committed, if you have players with no particular indication to show the talent, if you haven't a squad with a good body structure, the finals are two: or you are Barça and can sustain the difference with many WC players or you accept the fact and change.
Chelsea, Leicester, Atletico Madrid, Juventus, AS Monaco are examples of current modern teams and Arsenal, City, PSG, Napoli, Sevilla are examples of current surpassed teams.
Everyone now refuse to play the ball from the GK to the CBs, to have a typical #10 behind a striker, to have many playmakers and not BTBs on pitch, to play the ball.