No. This forum would represent a sample of loyal superfans. The most important group of Disney customers, who continue to return year after year. They purchase Annual Passes, frequently stay on property, purchase DVC. They evangelize about Disney to friends and family. They help their friends book and plan vacations. They raise future loyal superfans.
They do not provide an adequate sample of the "typical" Disney customer, no. I'm not even sure what the point is anymore, other than to suggest that FP+ is not designed to cater to fairness as making casual guests happy at the expensive of your loyal guests doesn't translate to the bottom line. Casual guests are just that, casual guests. Disney wants repeat business. They want the DISers, who come once or more per year, every year. They want the group they can count on to spend their money. They want the sure thing.
Even broader the point is still the same. Overall satisfaction will come based on their perception. I don't think I've ever met anybody who stopped visiting Disney because their room was too far from the bus stop or they were too close to the pool. Those are things that you adjust when planning your next trip. And we've seen there are some that don't want to plan future trips due to the perceived in-park experiences, not their room location.
You must not get my view. I totally believe Disney knows what will happen after testing and that it will provide a better experience for people. I do not, however, believe Disney spent such significant money to "level the playing field" between loyal fans who repeatedly visit and casual visitors who might visit once or once every five or more years.
Perhaps we should look at this another way. Over the past 10 years, what else has Disney done to provide a balance between dedicated and casual visitors? Assuming this is their goal, I would have to believe it's not a new one.
Edited to add: FP+ is, in my opinion, about moving towards the future. Enhancing Disney's ability to provide the best Theme Park experience. It will offer benefits to all guests, but most importantly to Disney. I do not believe that it represents a policy of fairness, where loyal fans are "punished" and casual guests are rewarded in an attempt to win the favor of casual guests at the expense of the loyal fans. I believe Disney places a greater value on loyal fans as they represent a more reliable revenue stream, year over year. I do not believe Disney puts policies in place to punish casual guests, but I also do not believe they create policies simply to reward them, especially as it relates to the experience for their loyal fans.