Based on the European ranking. And there should be more divisions so teams can relegate and rise. Atleast it would even the field and give opportunity to teams that no stand no chance to win a cl.
An nba type structure is also possible, with maybe all national teams in a cup so you will still have those matches as well.
I dont like it to be honest but with the way football is heading its better then psg type league wins every year, 50+ goals a season for strikers and the same 4/5 teams trading the cl each year.
Thats the way we are heading anyway with England set up to be the only competetive league left.
Then imagine in 20 years your kids will be like "that Messi guy you always spoke so highly of is nothing compared to this and this guy, since he only did it in a national league and cl was still a cup" It will makes us Pele type fanboys