Given ADA, would it be even legal for the California government to build this instead of a classic HSR? It's not even about claustrophobics, people in wheelchairs couldn't be serviced at all and obese people would be trouble too.
Serious question BTW, I'm not sure what exactly ADA mandates.
Now, I am sure that some variations on the system (have one row with only one chair for obese or no chair to allow people with wheelchair) would increase the % of people that can use the hyperloop.