Do the math.
Consider all the details.
It's not enough to say 'do this' or 'do that' in a grand, sweeping way.
How many current resorts and bus stops need a connection?
How do you get the new TTA/railroad/monorail system to cover each of those? What about future ones?
What does it cost to build such an elaborate transportation spiderweb across the WDW property?
How would that impact the look of WDW and the environment?
What happens when it rains?
How do you cover peak transportation times vs. normal and slow?
What cost savings are there really- less busses for instance and more monorail means more monorail cost, not less costs overall.
Projects that are presented in a professional manner to company management, in any company, have to be well thought out and have to address all the details, good and bad, large and small. They have to be thoroughly justified.