It's very interesting how quickly this move seems to be falling apart. I understand why people would be upset with the change because in general people resist change. However, how did these people feel in the early 90's when the Premier League and Champions League were formed? Those moves were driven by money just like this one. I was just listening to the Money Talks podcast on Anfield Index with Mo Chatra and Dave Hendricks, two people that aren't in FSG's pocket, and they weren't positive about the Super League, but they understood why it was happening. They also were clear that a team like Liverpool had to be part of this because any team not part of it will be left behind. Where would these outraged Liverpool fans be if they didn't join this league and were left behind as the clubs in the Super League dominate the domestic leagues with their financial advantages? Both of the hosts felt that the game was over for the fans back in the 90's so why fight it since for a Liverpool fan the team will be in better shape in the long run.
The German teams hadn't signed up yet due to their ownership structures which would have required a vote before signing on. PSG not signing up now, and City and Chelsea dropping out are a function of their owners not really helped by the extra money as much. When push comes to shove, if this league took off, all of those clubs will be part of it.
They also felt that in the long run this Super League would have expanded and grown to something larger with more teams participating.