maybe. But perhaps they would still get the people buying two park / multi-day tickets without the transport by Hogwarts Express. I would.
Creating a realistic looking full size steam train ride (even with screens in windows) would just be too disruptive and expensive I'd have thought, and not sure it offers a return on investment. Looking at google maps, its a long way to run a train that you can't see out of?
I think they will still get the business to both parks without it.
Plus, Hogarts Express doesn't go into Diagon Alley, so they have a themeing problem too.
May be they should do what Disney did with Magical Express, and run it straight from Orlando International
Creating a realistic looking full size steam train ride (even with screens in windows) would just be too disruptive and expensive I'd have thought, and not sure it offers a return on investment. Looking at google maps, its a long way to run a train that you can't see out of?
I think they will still get the business to both parks without it.
Plus, Hogarts Express doesn't go into Diagon Alley, so they have a themeing problem too.
May be they should do what Disney did with Magical Express, and run it straight from Orlando International

). 
im so jealous
They'll need to get their spies watching these boards as they develop their ideas!