And I also agree with that 100%. A better WDW system would reduce the number of cars on the roads due to many people now drive cars from thier on property hotel rooms to the park because the bus system just does not meet thier needs.
I order to do this Disney has got to come up with a new method of moving people. I understand that additional monorail is too costly, but I am sure they could come up with something. One way that I think WDW could do this is have sometype of street car/troley rail system that runs on tracks from Animal Kingdom to Downtown Disney that would connect the resorts/water parks along the way with a stop at the EPCOT monorail station.
While rail based systems sound nice, what happens when your train vehicle fills to capacity at Animal Kingdom and leaves people waiting at AK for the next train 10 to 15 minutes away? The first train is full and wont be able to pickup any or very few passengers at the resorts along its route until it arrives at Epcot or Downtown. So now you have people waiting on the next train at All Stars, Coronado, Swan, Dolphin, Yacht, Beach, and Boardwalk. The next train will pickup some people at AK and a lot of people at ALL Stars and then likely would be filled to capacity before arriving at all of the resorts.
Also consider the route from AK to Downtown. You are going to stop at the All Stars, Then Blizzard Beach, Coronado Springs, Swan, Dolphin, Yacht, Beach, Boardwalk, Studios, Pop Century, Caribbean Beach, Epcot, Typhoon Lagoon and Downtown Disney. Imagine how long its going to take for Someone at AK to get to Downtown. That route would be about 8 miles and take approx 20 minutes with the current bus system. A route by bus that made all of those stops would end up covering about 20 miles of pavement and take about 80 minutes. A rail route may have reduced mileage by a bit so figure 16 miles and 60 minutes taking into account the time it takes for people to enter and exit at each stop and so on. Who would want to spend an hour on a train to go form AK to DTD?
Fixed rail systems have the inherent problem of being unable to dynamically adapt to capacity issues. Also, as many will note, rail isn't exactly free of people getting struck by trains either as pedestrians or in their own vehicles. TO avoid that, you elevate the system which then makes the whole system just as expensive as a monorail.