In the distant past, clubs where able to rise from the bottom to the top organically, I think that ended perhaps in the 90s and then teams like Lazio & Leeds tried to pour cash into their teams but it was not a sustainable model and Leeds for example crashed to the lower leagues and remained out of the PL for nearly 15 years.
Even thoughLeicester has wealthy owner, they actually didn't spend money as Chelsea and City did, and they managed to win the league somehow organically (rising from the bottom to the top).
But aside from Liecester, I don't think any team was ever able to rise from the bottom to the very top organically (winning domestic league and competing in CL) since a very a long time, some teams might get a CL qualifying success from their domestic league (most recent example is Atlanta who played their first ever CL last year if I am right) or go deeper into the CL late rounds (Liepzig who reached SF last year).
Chelsea were a respectable side until Abaramovich stepped in and made them title contenders within 2 years, City started to buy better players when they were purchased by Thaksin Shinawatra in 2007 and then sold to Abu Dhabi Group in 2008, they became a force within 3 years and now are a constant fixture as a title contenders the league.
PSG were bought by QSI in 2011 and within a year dominated their league and bought the likes of Ibrahìmovich, T.Silva, Cavani, Veratti, Neymar, Mbappe for millions of dollars
These 3 clubs are owned by Mega Wealthy owners who can pour millions upon millions of cash into the club and basically killed any hope for any club to grow somewhat originically through success on the pitch and a sustainable investment from the success earned in the pitch.
Now what we have is Super League which will further kill any sort of competition that might allow for the likes of Atlanta in Italy to ever have a chance to have a sustainable success (place high in the league) which will allow them to invest into the club and build a stronger team that can somehow go toe to toe with Elites.
As for the Top 6 in England, Manchester and Liverpool can always rebuild and compete again as they are doing very well financially without outside money, Chelsea and City can also always remain very competitive as they have extremely generous wealthy owners, Arsenal and Tottenham on the other hand aren't doing well financially as Manchester or Liverpool, and they don't have wealthy and generous owners as City and Chelsea so perhaps they are actually the biggest winners from this debacle.
Sorry for the long write-up but what I am trying to say is even though this ESL idea is shitty one, this is way too complicated and there is the corruption issues at UEFA and FIFA level, and greed from bunch of rich owners who only care about money and profits and I am not sure how can this be resolved in a way that is satisfactory to all sides but I am against the rich owners doing whatever they want without checs and balance