Exactly! If Disney adds an experience to the parks and puts an up-charge on it, people will say, "You're still getting the same park you used to have, if you don't want the up-charge experience you don't have to pay for it. So what is it to you?" But Disney used to add these experiences and make them available to all, to give you more value for the park pass you've already purchased. By accepting the up-charge, we're all losing a piece of the way it used to be - and we're all losing a little bit of value. We don't pay for DS but still, the experience is changing (well, it's already changed in many, many ways I guess, but this is just the latest).
But I agree, if people are willing to pay it I don't blame Disney too much. If these lots are packed with cash-paying cars, I'm sure Disney will look to expand it everywhere they can. But don't worry, I'm sure there will still be free parking available... a few miles away. But that's ok... a shuttle will be available for a nominal fee...