A few points ...
I don't think this is about squeezing more money out of Uefa. Instead, these clubs don't want to follow someone else's rules anymore. They want to create their own rules. Their own schedules, their own TV contracts, their own ticketing schemes. They are going to make an ungodly amount of money while not having to answer to anyone else. FFP, as lame as it is in reality, will go out the window.
To emphasize how it is more about money than athletic competition...these owners aren't completely stupid. They can clearly see, like any of us can, that some of these clubs will go on unsuccessful runs for several years, just like they do now. But an "unsuccessful run" now in La Liga might mean 3rd place for Barcelona for a few years. Or 2nd place for Bayern in Germany. These clubs would instead now face the distinct possibility of finishing -- for example -- 12th, 14th, 16th, 11th, 16th during a bad run of years in this Super League. If an owner really cared about its club's football legacy and its supporters, why would he subject his club to such humiliation? Humiliation that's guaranteed to happen to most of these "Super Clubs" sooner or later in the next few decades if this concept becomes reality.
Eventually this Super League would expand. Probably to 20 or 24 teams after a few years. Then they would further destroy domestic leagues by picking off the remaining best teams and dictating terms to them. "Celtic, Ajax, Benfica -- you're doing quite well. Would you like to join? This is how much money you'll make (a lot, but less than us "Founding Clubs"). Here are the rules..."
It's ugly, all the way around.