I don't know when specifically for Disney/DME/Mears to Disney, but the airport is moving most if not all transportation options to the new "Intermodal transportation Center" at the south end of the airport. It will be next to the new South Terminal that the airport is building scheduled to open in 2022. The infrastrcuture may not be around in 2022, ie, the pickup points in Terminal A & B. Or if your flight arrives in Terminal C there won't be any.
I wasn't aware of this, thanks for sharing the info.