Here is an incredible article on Jacksonville's pathetic monorail and it's future.
https://www.bloomberg.com/news/feat...orail-makes-way-for-the-robot-bus-of-tomorrow
Why post it here? Because of this paragraph buried about 3/4ths of the way down the article:
"A public review of modernization options presented several non-starters. Extending the elevated track would cost up to $100 million per mile. Replacing the aging trains would cost at least $4 million each. Ending the service or tearing down the tracks would trigger repayment obligations that JTA officials estimate to be roughly $50 million."
Now, the Jacksonville monorail is a 2 car system. So essentially it is $2MM per car, for cars smaller than Disney's. With 9 cars per train, and 12 trains, WDW has 108 cars. So replacement costs can be estimated based on this somewhere around $200-$225 million. I'd put the accuracy of that estimate as +/- 50%, so probably somewhere in the $100-$350 million range to buy new monorails for WDW.
Now you want to know why Disney doesn't extend the monorail? There are 100 million reasons per mile. I've seen estimates for gondolas costing $3-$12 million per mile.
It's kind of fascinating when you get down into the details.