At some point, football fans will stand up and say 'enough'. We all like to watch Milan vs Real Madrid and games of high quality every week, but football fans of G20 clubs are going to wonder about their domestic rivalries, ticket prices; and fans of lesser clubs will hate the idea that they can't have a Saturday out at the Emirates or the Anfield and they will go nuts.
I think rich clubs are this type of initiative away from creating real fan revolt.
That said, imagine the quality of a league where the games were only amongst this lot:
Arsenal
United
Liverpool
Chelsea
PSG
Marseilles
Lyon
Milan
Inter
Juventus
Roma
Bayern
Dortmund
Barcelona
Valencia
Real Madrid
Atletico
Ajax
Porto
Benfica