I wonder if the probable need for social distancing to continue for the foreseeable will cause Amtrak to rethink their seating procedures on LD trains, with or without assigned seating.
I often ride the Palmetto from South Carolina. It has 4 coaches in addition to business class car, cafe, and baggage. I guess for crew convenience, not all coaches are available for passenger seating. I hope that practice is changed and passengers are encouraged, if not required, to spread out to all coaches. Assigned seating would certainly make that process easier. Because of increased passenger loads north of Richmond I suspect the Palmetto and other trains will require additional coaches. Of course that assumes people start riding trains again!