I don't know about this
According to Wikipedia, the Las Vegas Monorail is attempting a 2 1/2 mile extension and the cost of which will be around $400 million dollars plus the 14 mile long expansion of the Seattle Monorail would have had a cost of $2 billion or more but has since been cancelled
The riderships are high in these 2 markets and are bringing in revenue but it will be many decades before it would be even remotely paid off
Disney built their system 35 years ago when it was much cheaper and god bless them for doing so but I think such a thing in Orlando, even in the tourist corridor might be way too cost prohibitive unless the tourist tax is raised yet again