They wanted both when it was last around. Essentially a replacement of the champions league.Surely they can't do both? If they want their Superleague it must be at the price of forfeiting their domestic competitions, including cups, and European competitions that involve non-SL teams. They have already bought their way onto a level that few other clubs can hope to reach, so if the want to out-cock-wave each other, then bugger off and have at it! SL will be a televisual event anyway, so they could actually play the matches anywhere in the world, so they'll be getting the bunting out in Qatar, Beijing, Atlanta and a dozen more cities with a rich footballing history. But think of the money! I'm sure many real footy fans all over the world will be thinking it's time for these mega-clubs to go.
Regarding fan pushback at the clubs themselves, you can see their point. The same old faces year in - year out, and awaydays to Munich and Madrid don't come cheap! Ultimately the decisions will be made by owners, not fans, and we know how much regard they have for each other.