These surveys are not great indicators of how well these pricing things would actually be receved. Disney asking "hey, if we charged x amount, would you still stay here?" is not totally representative of what people are actually going to do. First of all, when you're on the actual trip (and assuming you're enjoying it) you might be in a higher mood and your answers could tend to be more positive, which wouldn't represent what decision you'd make at home. Unless people are being asked this not on their trip, through email? Is that what's happening? Either way, theoretical answers don't measure up to people's real decisions. On the other hand, people who can read through these surveys should know to answer "no" to any question about price increases. Obviously this doesn't give an accurate reading either. So these surveys, while they aren't useless, shouldn't be given too much value, and I do think TWDC knows that.
A good use for these surveys would be to compare the reaction of one potential price increase to another. That way, maybe they could assume that there's the same "percent of unrealism" in people's answers and directly compare the numbers from both surveys. I wonder if they've done that.
Also, and maybe you all don't share this opinion, but I think it's odd, and almost a bit rude, to ask people about how they'd react to a price increase. I've actually never gotten a survey about that but it just seems off-putting. Like, you are enjoying (or enjoyed) your trip, and then you're being asked if you'd still have come at a higher price? I appreciate how open and transparent the questions are but I don't know if others share that appreciation.
I'm all for surveys and think they're an excellent idea, particularly when they give a good reading. But I think the smarter thing to ask would be the classic "on a scale of 1-10, how would you rate your experience at _____?" And then use that as an indicator of whether to raise prices, make changes, etc. Sure, it doesn't give a perfect result either, but at least it's a more friendly question.