You're comparing a warehouse to a train even talking about Waymo.
FSD has no limit. Recently it has been tested around in Europe and Asia, and the existing tech basically "just works" because sensorily and thought-wise it's made to function like the common meatbag between the seat and the wheel, just better.
No, making the skyscraper 100 meters higher isn't going to make the train less relevant even though the tracks aren't all built yet.