Yes,the crypto industry is limited for the disabled people,but can you answer these questions:
Is it easier for physically challenged people to use fiat money(cash)?
Is it easier for physically challenged people to trade on the stock markets?
Is it easier for disabled people to use gold or any other precious metals?
Disabled people are facing difficulties everywhere,so it's pointless to put the blame only on the crypto industry for being not enough user friendly for disabled people.