The reptilian part of my brain, which is somewhat disposed to conspiracy theories, wonders whether Iger is deliberately pumping the well dry. Disney is seemingly striving to exhaust all earning potential from its movie franchise IP within just a few years, leaving very little new franchises in place. Of the few new IP successes Disney has bought to market recently, Frozen at the very least seems to be something of an unplanned success.
Whoever takes Iger's place is going to have their work cut out for them keeping Disney's movie machine printing cash as efficiently as it is right now.