This exactly - I don't think Disney is stupid enough to get rid of ME and the Resort buses. While not everyone comes without a car, I would say the majority do, and that trapping of folks on property is a HUGE money maker for Disney. For me, it's one of the things I love about Disney trips - not having to drive for 10 days. It's what stops me from complaining when I get a bad bus experience. It's amazing though to me - since I would say 19 out of 20 times using Disney transport it is wonderful, but that 20th time, where someone had to wait 30 minutes for a bus - that's all they remember - like it ruined their trip.
Anyways - back to my point - ME was a genius move for Disney. It's probably costs them less than $30 per person to do it, and the "cost" is just embedded in the resort room costs, and instead of people driving off property to eat and shop, they do all their eating and shopping on property.