The silly thing is, even if Disney's dream came true and they got their own station at Celebration, visitors would still have to board buses, because Disney's current management is too cheap to extend the monorail.
Orlando's a tough call when it comes to inter-city/cross-state passenger rail, because every location not requiring massive new ROW has some kind of fatal flaw. MCO seems sensible on the surface... until you realize that the CSX tracks are really a 10-minute shuttle ride from the terminal. Kissimmee's station is almost as geographically far from Disney as a brand new station in Downtown Orlando near Church Street would be. The existing Amtrak station in Orlando isn't that far from downtown, but it's about as pedestrian-hostile of a walk as you could get.
IMHO, the ideal Orlando scenario would be for them to start at the spur south of MCO, veering northeast at the point where the spur turns southeast and continuing to the edge of the non-secured passenger councourse, becoming elevated as it approached so the station could go above everything (since it would only be for passenger trains, they could get away with grades that freight trains could never handle). Then, from there, they'd backtrack to the mainline, and continue north to downtown, skipping what's now the Amtrak station, and stopping at a brand new station a mile or two north, near or at Church Street Station, with the tracks themselves depressed into a trench through the area so cars exiting I-4 wouldn't have to contend with busy grade crossings or stopped trains.
Really, though, if the new Downtown Orlando station had rental cars, secure overnight garage parking, and was served by the future light rail line to International Drive, they could just skip the new airport station and stay with the shuttles since 99% of the reason for taking a train to the airport -- abundant rental cars, safe overnight parking, and ground transportation to area attractions -- would be available at the main station downtown anyway.
