Anyone who believes surveys on mass transit is doomed to go broke. It is politically correct to say you will use a train. However after it is built and you have to decide to spend the large amount on the ticket you will reconsider. Take NJ to NYC as an example. The cost of NJ Transit is just about the same as driving. People say they will take the train but don't because driving even with all the traffic on the GSP and NJ Turnpike is more convenient and faster. For the record NJ Transit is a huge money loser. Faster only because you don't have to wait for the train and all the stops.
As for these new lines to WDW, I think it's possible a line from MCO to WDW would be successful but only with Disney taking your bags, checked and carry on. from the airport to your room and including the ticket for the ride. The current magic Express is better than the proposed train to a central point because the current system takes you to you resort and doesn't require a connection and additional wait. The train from Miami and or Tampa will not be successful. The way the proposal looks profitable is using the real estate for the profit. The problem with that is it's the same process we used to build the railroads in the 1800s and once the it was developed the trains couldn't stand on their own and died. Finally, trains depend on a single route while busses have routes that can be changed and updated.
As for these new lines to WDW, I think it's possible a line from MCO to WDW would be successful but only with Disney taking your bags, checked and carry on. from the airport to your room and including the ticket for the ride. The current magic Express is better than the proposed train to a central point because the current system takes you to you resort and doesn't require a connection and additional wait. The train from Miami and or Tampa will not be successful. The way the proposal looks profitable is using the real estate for the profit. The problem with that is it's the same process we used to build the railroads in the 1800s and once the it was developed the trains couldn't stand on their own and died. Finally, trains depend on a single route while busses have routes that can be changed and updated.