The thing is the monorails also pollute, just not directly. The monorails run on electricity which of course is typically produced by burning fossil fuels.
Like you I think these numbers are misleading. If you arrive to MK by car you have no other choice but to ride the ferry or the monorail to get to the park. It is like saying that 100% percent of the people that go to Castaway Cay arrive by boat so the boat must be the best way to get there.
Do you people just really not like monorails?
I mean to go to such extremes to discredit monorails as to say they pollute indirectly. Thats about the weakest argument against monorails there is. Of course anything using electricity pollutes indirectly. You might as well say there bad for the environment because every once in a while a monorail might hit a bird. Everything has its share of disadvantages, monorails just happen to have fewer.
Personally to me my ideal form of transportation at WDW would be monorail, this doesn't mean I think that the monorails should connect to everything throughout the resort. But a well though out monorail system connecting all of the major centers of activity would be a great convenience and far more efficient than the buses. This is the type of monorail system that was originally intended for WDW before Walt Disney died.
You can argue that monorails are inefficient all you want, but you'll always be on the losing side of that argument. Monorails have been a proven efficient means of transportation for over a hundred years and will be for many years to come.
Monorails are the ideal form of transportation in a vacation resort, this is why they have been so successful at WDW and why they are still being chosen at other vacation resorts throughout the world.
Dubailand will soon take it's place as the largest Theme Park resort in the world, and the owners and developers there have chosen monorails to connect their resort. Monorails have a lot to offer faster transit time to your destination, shorter wait times, reduced costs for their operators, more efficient means of transporting people, more fun to ride, and they certainly look nicer in a resort setting than roads crowded with buses.
If Monorails were not an efficient, convenient, and pleasant means of transportation you wouldn't see them being constructed in other resorts. Just because WDW doesn't expand their system doesn't mean it's not a viable transportation means. WDW's time has come and gone a peak for development was reached some time ago and in the coming years the new leaders in the theme park resort business will show the world how a vacation resort is done right.