Relatively sure those were reports of test audiences making Warner consider a shake-up in the movies based on Superman still being a bit shit.
The report was that there was some nervousness that it would not be a crowd pleaser. McWeeny or whatever his name is then speculated that perhaps there would be a shakeup. Many on gaf jumped on that and ran with it.
Movies are made to turn a profit. Crappy movies that do well get sequels (Pirates of the Caribbean shows us that) so the notion of movies being canceled would mean that it was a financial failure. FF1 bombing led to FF2 disappearing from future plans, for example. Amazing Spider Man 1 sucking, but doing well financially did not prevent ASM2 from happening.