I wonder if a blind person could sue for one under the ADA?
Very doubtful, there is a test the courts use in deciding certain constitutional matters known as the "substantial government interest" test. Basically it's a balancing test where the government (state or federal) must prove that it is entitled to regulate or limit (but not eliminate) certain rights and freedoms guaranteed by the Constitution in order to enforce or protect a substantial government interest such as the safety of its citizens.
For example, the 1st Amendment gives us the right to free speech but it is still against the law to yell fire in a crowded movie theater.