I don't really think this is about the corruption allegations against FIFA, but that is being used as a convenient excuse for these clubs to do what they've always wanted: to remove the shackles of regulation and be free to run their own affairs completely. I don't have much faith in UEFA or FIFA, but the Super League would be a disaster for football. Now, Wenger and the board can drop the pretense that we're a football club and will be allowed to run the club purely as a private business, which will mean the fans getting even more shafted than normal. Moreover, the clubs not involved in this elite cartel will suffer if there is a breakaway, their diminishing revenues from TV Rights etc could irreversibly damage lesser clubs and the lower leagues as well.
Whatever you think of UEFA and FIFA (and my opinion of them is not high) we need these international institutions to govern football clubs who are owned by free market fundamentalists who have nothing but contempt for the fans, and are only interested in lining their pockets.