Blind people can read through the Braille writing system and they also can hear if they are not deaf. Bitcoin has one method to back up their private key or mnemonic seeds to metal sheets and it can be used for the blind.
The barrier is how companies can build up those products for the blind but still can give them privacy and safety for their private key/ mnemonic seeds. For the blinds, I think mnemonic seeds are best for them.
Yes, Braille system is already used on several traditional banks ATMs, but my perception is that most blind people still need human guidance when doing bank transactions because they weren't educated in Braille system since they were younger. It's something that changes slowly as education plays a bigger role in disabled people's lives within the new generations. For this reason I expect blind people won't have issues when dealing with crypto in the future.The barrier is how companies can build up those products for the blind but still can give them privacy and safety for their private key/ mnemonic seeds. For the blinds, I think mnemonic seeds are best for them.
Another good idea as mentioned are the voice commands, however they still need a lot of improvements in technology and artificial intelligence to make it possible to have a safe and smooth experience, especially because we are talking about personal finances.