If only the champions league was for the actual champions of each league no second,third or fourth place teams they could go in the conference champions league or something, the players would be happier, presumably fewer better quality games.
Better quality games? You have to be joking.
If the Champions League was restricted to the League Chamions that would leave us with City, Internationale, Bayer, PSG, Sporting Club, Real Madrid, PSV, Club Brugge, Midtjylland, Sparta Prague, Slovan Bratislava, and Jagiellonia Bialystok. That is before we get around to to the likes of Lincoln Red Imps, UE Santa Columba, TNS, Larne, Shamrock Rovers, etc. etc.
So no Bayern Munich, Borussia Dortmund, RB Leipzig, Juventus, Atalanta, Milan, Atletico, Barcelona, Porto, Benfica, Arsenal, Liverpool, Villa, Monaco. etc.
It is not going to happen. Harking back to the crap situations of the late 1970s to the 1980s, Forest won the European Cup in 1979 by beating Liverpool (holders), AEK, Grasshoppers, Koln, and Malmo. Forest retained the title in 1980 by beating Oster, Arges Pitesti, BFC Dynamo, Ajax, and Hamburg.
It would be a tough sell to sponsors and I suspect to many supporters. It is not going to happen.