The ALMS, ELMS and even LeMans is ultimately run by the FIA. It's possible the ACO could break away from the FIA if they want Ferrari bad enough. It would mean that Ferrari would have only 1 race per year. DP would be alot easier, but there doesn't seem to be a great deal of benefit, as it is a very poorly advertised series, and very, very few anywhere but the in the US care about it...
Can the Pope become a Muslim? Ferrari is F1 and F1 is Ferrari. No separation possible without destroying both. And they know that.