After looking over the box office returns again, I can't really see any reasonable way to regard decisions on how STID was marketed as mistakes, if by a "mistake" one means something that hurt the bottom line. If STID had been a failure or only a marginal success, then second-guessing or Monday morning quarterbacking the marketing campaign might be in order. But given that STID was a success, how one could validly argue that the returns would have been better, if only someone in marketing had done thus and so, is really a mystery to me.
They just shouldn't have done Khan in the first place.
This is by far a more respectable position than getting bent out of shape about how the film was marketed.