Interestingly enough, Brightline was asked in a presentation to the Central Florida Expressway Authority about competition with Sunrail over that corridor from the airport to Disney World. Brightline's response was that they do not see Sunrail as competition and that they have no plans to market the connection between the two stations. That, to me at least, would indicate that they have no plans to replace the Disney Magical Express bus.
I find that to be a very bold strategy since selling a premium transportation service from the airport to Disney would likely give them much needed revenue and publicity. Logistically, I would think that it will also be a great benefit given that Disney will serve as the endpoint on the line until Tampa is completed in 2029 (I believe)-- since many passengers may end their trips at the airport, the trains would conceptually have capacity to spare for an airport to Disney crowd. But I wonder if they are more willing to hand that advantage to Sunrail in exchange for track access fees and a commuter rail service that will allow Brightline travelers to connect from the airport to downtown Orlando and other points along the Sunrail north/south corridor.
I find that to be a very bold strategy since selling a premium transportation service from the airport to Disney would likely give them much needed revenue and publicity. Logistically, I would think that it will also be a great benefit given that Disney will serve as the endpoint on the line until Tampa is completed in 2029 (I believe)-- since many passengers may end their trips at the airport, the trains would conceptually have capacity to spare for an airport to Disney crowd. But I wonder if they are more willing to hand that advantage to Sunrail in exchange for track access fees and a commuter rail service that will allow Brightline travelers to connect from the airport to downtown Orlando and other points along the Sunrail north/south corridor.