One of the justifications I saw posted was "they charge for parking at
Disneyland..."
Something else they charge for at Disneyland: The
Disneyland Resort Express.
That's the bus that takes you between the airport and your hotel.
This new charge leaves no doubt in my mind that the Magical Express will eventually be on the list of up-charges.
You could say Disney won't charge for ME because they benefit from it by using it to keep people locked into the property, but this new parking charge is going to keep people from even getting on the property - or at least staying fewer days on property.