Not the PP you quoted but I'm thinking it is not about the one ride…I think the one ride for many people is the last nail in the coffin. Disney has a lot of construction going on that has closed other rides and made it harder to get around. I think when people factor in the construction plus one of the bigger rides being down that is when people consider other destinations. Let's not forgot prices will likely go up in the near future for tickets, which considering the state of the parks, may make it for some not worth it.
Also, sometimes one ride is that important. My husband loves the Buzz Lightyear ride (don't ask me why because I find it annoying how hard it is to aim) and we are going during the time Buzz is down. My husband, who is not a fan of Disney, complains to me every time we discuss our trip about how upset he is that Buzz is down. If I could move our trip around to a time Buzz was open, I would. Sadly, due to both of our hectic work schedules and other commitments we don't really have any other time we could go. Also, had I not already bought plane tickets and his park tickets, I'm sure my husband would want us to skip Disney this year because of Buzz. I know once we get there we will both have fun but to him that one ride is so important he would consider changing our vacation destination.