The main reason i think it would be good for Disney to introduce a monorail system connecting at least just the parks (im talking blue sky here, screw costs, space etc), is because i feel it will help with park hopping. People may be more willing to go to Animal Kingdom.
At the moment Animal Kingdom is isolated so to go there you have to make it an event so to say, where as at the MK if its busy or you fancy a change you can hop of the Monorail.
Generally we always park at Epcot, that way we can Monorail to MK with out the fun of the TTC, or to change to MGM is a relatively simple task. However Animal Kingdom is a park we only go to when we put it aside, we never just go to take a look like we do with the others.
