Yeah, having a business that you have busted your hump and sacrificed to build up over many years suddenly dry up and blow away because a multi-billion-dollar megalithic corporations starts giving it away free as a promotional perk tends to cause peoples' grapes to go a little sour.
Of coarse, Disney has a perfect right to operate a service like DME, and I think it is long overdue. But I do think that they will not provide the service for free in perpetuity; I'm certain that they will begin to offset the huge cost of DME by charging for it at some point, and knowing Disney, they will charge the same or a little more than Mears charges on their own busses ($29 r/t).
DME will become a perk that Disney can throw in for free for limited times, like the
free dining plan, that will be very useful as a marketing and promotional device.
Personally, however, I will continue to rent a car on every trip. I'm willing to pay the extra money, and handle my own luggage, in order to be freed from hassles of riding in a shuttle with 50 other people.