As seasonal perhaps MCO will be work. However with Virgin Trains (formerly Brightline) service from MIA to MCO not sure how long the flight will survive. Just fly the TLV MIA non stop and hop on the Virgin Train to Orlando.
A Virgin train to Orlando will take you about 4 hours from Miami and cost you the same or more as a round-trip plane ticket from Miami. I don't see that being a hugely successful endeavor. I live in Orlando.
A Virgin Train Orlando to downtown Miami is supposed to take 3 hr 15 minutes. Predictions are about $50-$100 one way for coach which could easily end up being less than flying, especially considering the comfort level. Plus, the train will be more convenient, having no TSA checks, good frequency (16x a day), and if one is flying in on an international carrier, likely departing the same terminal. I don’t think flying is much competition for the train (I seriously doubt people who aren’t connecting in MIA fly there from MCO). The competition is driving. That being said, I see my family (who live in Orlando and Miami) using the train a lot. This are very excited for it.
People in Orlando are not excited at all about the project. I mean why would I use it if I can drive in the same time (using FL Turnpike). You are right, driving is the main competition, however the train will open up better connection for people in MCO to Cocoa, Melbourne, VeroBeach, Port St. Lucie, and West Palm to a lesser extent. It will give them convenient access to a major international airport (MCO) with many non-stop destinations. So, in terms of air traffic, it does make sense. In terms of tourism and city-to-city travel not so much. Most, if not all passengers on MCO-MIA or MCO-FLL in case of JetBlue and Spirit are connecting anyways to further destinations. People living in Orlando or Miami will continue to drive (those who are able to). Oh, on a last note, neither Miami and definitely not Orlando have a good public transport system once you arrive in the city.