I agree that Disney words their surveys carefully, but I've been asked point blank in a park exit survey if I would pay for it. They asked lead-in questions about if I used FastPass, if I thought it improved my enjoyment of the park, etc, and then asked if I thought it was a system I would be willing to pay for.
Since I said "no" to paying for FastPass and I can't imagine I'm the only person that got asked that survey and responded the same way, I'm convinced Disney knows FastPass is VERY popular but they'll never get people to pay for the current system.
What we're seeing now in this round of surveys is them figuring out WHAT it will take to get people to pay for it. Enhancing the benefit is the most obvious way to do that, because the system is so ingrained into people's touring schedules now there is no way Disney could reduce the current system and not face backlash.