The iPad mini might be a much hungrier cannibal than Apple (AAPL) had anticipated. Unnamed sources have told Digitimes that Apple has drastically cut its 9.7-inch iPad shipment estimates from 60 million to 33 million in 2013, due largely to the unanticipated popularity of the iPad mini. According to Digitimes‘ sources, Apple is ramping up iPad mini production and has boosted its projected shipments from 40 million to 55 million this year. However, Apple’s supposed new estimates also show a possible drop in overall iPad demand since it now projects to ship 88 million iPads and iPad minis this year, down from the 100 million reported earlier.