If I'm not mistaken, wasn't RCID heavily involved in financing the construction and ownership of the parking garages? Given that they were built with "public" funds (to the degree that RCID is a government), it seems like it would be a bait-and-switch to build them under the premise of being free, and then charging a year or two later. Realistically, I can't see them charging for the garages any time soon, especially with a third one on the way
I assume Disney fully owns and operates the surface lots themselves, right? Or at the very least, the RCID investment has sufficiently depreciated since they were built 20+ years ago. That would make it much easier for Disney to adjust (and profit from) pricing for those areas, and likely why they were chosen for "preferred" parking, even though they're not as convenient for most people