I think we're missing a really big story (or at least part of the story) here, and that's why they suddenly tried to launch this now.
Super League plans have been formulating for 15 years, yes, but this was not a well though out attempt. I've said in a comment before how they could have done it much better quite easily, and at the very least they should have brought on some PR agency to draw up plans, handle the outcry, present the structure in a meaningful way.
This was a seriously last minute thing, 2 English clubs were invited the day before the launch FFS and PSG and Bayern weren't even tied down.
And the other thing is....August! They wanted this to start in August. That's insane. Look at the CL reforms...approved in 2021 for a 2024 change. And that's an existing competition without a legal minefield to get through.
It's not just rushed, it's bloody desperate. They knew if it failed they'd be stuck in UEFA for a decade at least and they still tried this embarrassingly amateur attempt.
I don't know what it was, but something made Perez and Agnelli jump and try to rush through a plan that should have been 6 months or a year in the making in 1 weekend.
I suspect the finances at Real, Juventus and Barcelona are much, much worse than people are predicting, and that this whole thing was precipitated by Joan Laporta realising after a month in charge at Barcelona that the club is bankrupt and reaching out to Perez.