
Fo Shizzle!!!!
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When an engineer creates rides, there are several key things they focus on and unfortunate for some, it is not weight/size. Putting functionality aside, because that is a given, safety is a huge primary concern. Right at the top.
Additionally, fitting as many people into an attraction as possible to keep the lines moving is another.
If you ever have an oppty to speak to a Disney Imagineer (such as Dining with an Imagineer, a specific tour in Burbank or if you happen to know somebody) and mention the size limitations for Seven Dwarfs Mine Coaster, they will tell you that they knew "larger guests" would have a more difficult time, but in order to have the ride function as it does and remain safe, that had to be the design.
Disney is not trying to slight anybody. It is unfortunate for those who are unable to ride, however.