The lawsuits and the continuing exploitation of Siegel and Shuster is the only reason this film is being made. I don't know if Sucker Punch bombing will matter much, but other statements of Snyder's makes me question how good a choice he was. It could easily underperform, but even if this movie does do less than WB wants, it will serve it's legal purpose.
WB/DC has been clueless with Superman for 25 years now, so major changes in philosophy would be required for that to change. The one redeeming thing for this production is the casting so far and Nolan's involvement. But I don't think Snyder is a bad thing for it...he'll be motivated than ever now to prove he can deliver a good movie. I do question his understanding of Superman and his tastes in Superman comics, however. All I know is he likes Jim Lee (kissing his ass), Curt Swan, DKR, (which is crap) and Death of Superman, which is pretty overrated and shallow. So the only good sign so far is he said he like Swan's Superman. And the casting decisions so far which are hard to argue with.