FWIW, very few people are wearing them on trains now. They’re optional. That wasn’t true last year.
ETA: I should also note that many people don’t go the whole length of the distance trains. Amtrak sells passes for so many “rides” (or whatever they call them) within a period of time and one can get on/off as they please, with reservations if you want them, but many just showed up at the station. Some trains are full so I’d worry about the latter if one wanted a specific train date. Many people go the whole distance, but make their stops along the way meandering.