In today's day and age, playing the MVNO game is a bit of a challenge. Some can't keep their head above water, others need a life raft, and a select few can actually stay afloat on their own. Disney's CFO Thomas Staggs -- who spoke at Merrill Lynch's Media and Entertainment Conference recently -- alluded that Disney was in the process of evaluating "where it sits" because of "some challenges" having the Disney Mobile brand distributed. "It's still too early to determine any losses for the MVNO," he concluded. With a variety of services targeted at kids filtering through virtually every mainstream carrier these days, does Disney still have a solid business model to work with?