If I were to venture a guess signs are leading more towards charging FP. Charging for DME would hurt Disney's bottom line, not help it and they already have the alternative pay-required Minnie Vans running.
As for FPs Disney is already stuck in a bind. They have to keep the 3 advanced reserve FPs free or people would scream 'bloody murder' but as Owl has mentioned, there is potential for Disney to possibly charge for additional advance FPs or additional low wait events similar to DAH and EMM. I still think that Disney Resort guests should get the higher privilege though since they're trying to keep us on property and all.