I think the biggest issue with CAHSR is that Florida just did it anyway.
Be careful citing the Brightline as a success. It is expensive, doesn't go to many places, has low ridership, regularly kills pedestrians and drivers, and is hemorrhaging money.
Ah yes, the train that seeks you out and kills. Much like all the free-soloists who are killed by the ground. Come on man. Expecting people to stay behind barriers and rail lines is a basic expectation.
Brightline has killed zero people. If anything, it has reduced ~150 deaths by guiding people to a safer mode of transport. Ridership has tripled in 3 years. Brightline is a private company, so you can be sure that they are charging a decent price for each ticket, and the demand is still there.
Brightline aims to make money by developing properties around this new value add (the train stations). They are making massive profits off their first few developments. The housing developments are owned by Brightline's parent company, so they don't show up on Brightline's balance sheets.