It should be a long-term win with some short-term pain. Disney shouldn't have any hard time recruiting creative talent once they're up-and-running. All indications are that they'll have state of the art facilities, and they'll be able to offer above-market (for Florida) compensation while still saving money.
That said, in the short term, they're going to have HUGE turnover, which is expensive. They'll be able to get new talent, but their existing talent are largely "California people" and "California people" don't want to move to Florida.