Ok, a few thoughts. According to the Brightline site....they won't open until the second half of 2023, which probably means 2024. And as mentioned, they aren't in the business of short haul service. Will Disney tap into this rail service? Perhaps. But, it isn't going to happen quickly. And even if it did, I doubt luggage would be provided for. So, a luggage delivery service would have to be put in place...similar to what DME offered. Wouldn't be difficult, no need to reinvent the wheel there. But once guests get to the end of the rail line in DS, what then? Will Disney offer buses to the resorts? Probably. Just doesn't seem all that efficient to me.
So, what will guests do? I seriously doubt more will be renting cars. The rental car industry didn't take a hit when DME came into being. The town car/limo services did. Most guests aren't thrilled with spending that much money to rent a car, and believe me, when there is a need, the rates go up!!! So, we will probably see uber/lyft taking more people to their resorts, and we will very likely see town car/limo services pick up again!! With Disney charging to park in their resorts now, it will be cheaper to use a car service vs renting a car!!!
And sam_gordon?? I have to agree. My times using DME ran between 60 and 85 mins. Usually right around 75 mins....so if I add that time to getting to my room, then taking a bus to a park? We're at 2 hrs. Only once have I had all the stars align, and been at my resort within 55 mins of deplaning....10 mins walk to DME, 5 mins to check in, walked right onto the bus, no wait, last to board, then 40 mins to resort...last of 3 stops. But that was one time, in all the times I've taken DME since it started!! And I can't begin to remember how many times I've used it.