We can all debate whether SR or BB was the better movie or which performed better critic wise and BO wise. We can also debate the exact reasons why SR "underperformed."
But, from WB's perspective at least, it is very clear to me which movie was more successful. And that's BB.
Why?
Because BB has already had a mega-successful sequel in TDK ( which was released 3 years after BB ) and there's already talk of a 3rd movie.
The same happened after the 1st Spider-man movie and Iron Man. Both of those movies were successful, and plans for the sequel were announced fairly quickly.
This summer will be 3 years since SR came out. There still has been no official word as to the future of the franchise. If a sequel were to come out this year, production on it would have been well underway by now. We would already know what the sequel would be about, who the new villain(s) would be, etc. We would NOT be in this murky, ambiguous mess or "waiting period" that we are in now. We would be discussing FACTS ( not rumors or speculations ) about the next Superman movie....not endlessly discussing/debating SR.......
So, in WB's eyes, the Batman franchise has been more successful than the Superman franchise.
Now, could there still be a SR sequel released in the next few years? Yes. This whole Superman Unleashed thing seems to point in that direction. But, WB needs to get the ball rolling fairly quickly if they want to make a sequel.
The longer they wait to make a sequel to SR...the longer they wait before they start releasing some official news......the more likely it will be that we won't get a SR sequel and that SR will indeed become a "footnote."