Another reason ME probably does’t to Amtrak from the Orlando station is the only way to get to the parks would be I4 which is a mess between Orlando and the parks.
As some of you might know mass transit has been a hot topic in Orlando. While HSR was stopped between Tampa and Orlando, Central Florida is getting Sunrail (which is a commuter service). Sunrail planning does eventually include access from OIA to International drive (the convention center) but at this point no real plans to connect tp Disney or even the other parks.
Sunrail is more for us folks that live here to get north south and stay off I4.
There is HSR coming to Florida via a private group. It is called All Aboard Florida and it will run from Miami International to OIA (with stops in Fort Lauderdale). Eventually they plan to run to Jacksonville and than to Tampa. The group has reached out to Disney about a possible connection point but has not heard back from Disney (as far as has been reported).
From what I remember of the HSR debate there aren’t any right of ways near WDW and that those would be hard to create because of development around the parks. The HSR in its dying breath would have had a stop near WDW (across I4 from Celebration) but no connection with the Orlando Amtrak station (OIA to just outside Tampa International).
During the debate on HSR/Sunrail I told a number of people why Orlando didn’t pay attention to Walts original EPCOT proposal. That if they would have Orlando/Central Florida wouldn’t be so locked into to freeways/tollways, cars, and buses. They could have put in monorails!