The thing is, I-4 won't need to be deserted...if this takes up even 20-30% of traffic from I-4 it will help traffic flow, specifically in the main Orlando and Tampa downtown areas.
The key to this is the other infrastructure around. Disney obviously has theirs, the Airport, International Drive, but for those trying to get to other places, will it be better to try to take a taxi or bus once they arrive at one of the stations? That is the question.
I agree. It's going to take a good deal of time (and money, both public and private) for Orlando to build up the infastructure of a Boston or NYC. It's one thing to put in a train station, another to build the remaining infastructure around it....