The lesson, presumably, being that executives know what will sell. Fair enough, but just because something sells that doesn't automatically make it good and just because something fails that doesn't automatically mean it's bad. I understand that Disney needed a moneymaker after the spectacular and very expensive failure of John Carter (which really should have done better given it was an impressive entry in a generally profitable genre), but that's no excuse for bad storytelling. To paraphrase Shigeru Miyamoto, "A delayed film is eventually good, but a bad film is bad forever".