No, not if a bit of talent, creativity, and imagination is applied to the attraction development process (quantities in short supply within Disney anymore). Most classic Disney experiences exclude absolutely no one, yet are enjoyed by most people - Haunted Mansion, Pirates, Living with the Land, Great Movie Ride, Kilimanjaro Safaris, etc.. Sure, Spaceship Earth may not be the favorite of thrill freaks, but it remains something worthy of their interest and an experience the entire family can share ("an amusement enterprise built where the parents and children could have fun together" - Walt Disney). You have to consider the audience, and WDW is populated by far more families, seniors, young children, and other adults who have less interest and tolerance for extreme thrills than the typical theme park.
There is simply no reason that in 2011 you cannot design an innovative, state-of-the-art attraction which is accessible to and enjoyable by essentially everyone (The Little Mermaid and Toy Story Mania come to mind).
You are always going to have individuals who don't like something, but they are exceptions to - and not representative of - the larger group (most people like ice cream, but I'm sure there is somebody out there who doesn't). You can't try to please every individuals personal taste, but that hardly means a ride designed for everyone is in any way compromised, dull, or less immersive and interesting because it doesn't exclude a particular group. The primary factor excluding people from rides is the thrill factor (and associated height requirements), and relatively few Disney attractions are thrill rides. That doesn't mean there is no room for a thrill experience in a Disney park (Space Mountain, Big Thunder), but it does probably mean they will be tamer than "thrill ride' counterparts in many other theme parks and they will be fewer in number and farther between in development than attraction experiences which are designed to appeal to a wider audience (families) and accessible to all.
Well, as I've suggested above, you probably should have a lot of omnimover attractions in a Disney Park - such storytelling and showmanship is what the place is all about. While there are plenty of them, and again while there is room for some thrill experiences in the parks, it is also true that many of the major E-ticket additions to the parks over the past 10-15 years have been "thrill ride" experiences. The omnimover "dark ride" attractions are aging. We're arguably long overdue for more such attractions than just Mermaid, though it is a welcome addition.
