If you can't stand being in an enclosed space like that, there's still the interstate. Is not meant to be everyone's ideal solution, it's meant to be a good solution for most people.
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.