Barca and real Madrid are two of the richest sports franchises in the world. Look at all uefa champions. They are all the big spenders. It's already a system of the haves and have nots.
In addition, it's also worth pointing out that those two clubs are also massively in debt:
https://www.football-espana.net/2021/01/27/real-madrid-accou...
https://www.football-espana.net/2021/01/25/barcelona-on-the-...
If (when?) this new league falls through it'll be interesting to see what happens to big clubs like these that, despite all their success and big brand, might have been relying on this extra money to see them through.
* system of "haves and have nots" where haves have advantage,
* two tiered system of "haves and have nots" where haves have build in advantage in the rules and have nots have additional disadvantages on top of lack of money.
Also, making everything into dichotomy where something not being perfect is a reason to make it even worst is also a very American cultural tendency. No, just because it is not perfectly fair now does not mean it is ok to make it even less fair. And just because solution of problem is not perfect does not mean it is pointless.