I am interested to see how this goes and, if it works out, it will fall into the category of a lot of moves Disney is making lately that I don't personally like but I can't blame them for if customers swallow each extra cost and cutback enthusiastically. It just makes me less likely to go, but I doubt Disney cares.
My impression is that they have had a harder time with their paid version of Fastpass in Paris, and this may also come down to cultural differences. I think consumers in the US are conditioned to expect upcharges, right down to sales tax not being included in the sticker price of items and restaurant bills having an effective 15-20% upcharge to pay for labor. "Resort fees" on top of the quoted price for a room also fall into that category. So, maybe extra charges sprinkled through the parks will be greeted with a bit of a shrug by those who can afford to go.