I agree that lawyers are the real problem here. Its an easy lawsuit and its not fair. However, the laws have now been on the books for many years and a great many businesses have willfully ignored the laws and done nothing.
Don't knock the ADA laws, unless you've been disabled/impaired or had to take care of someone who is. For far too long people with mobility impairments were kept from participating in much of every day life by the simple problem of access. They couldn't shop for groceries, use public restrooms, eat at a restaurant go to a movie, shop for clothes, etc.
My mother was confined to a wheel chair for several years before she died. The ADA laws were in place, but their wasn't much as much compliance then as their is now, believe it or not. Unless you've experienced it you may have no idea how difficult it was for me to do the simplest things with her. Whether its a wheel chair, walker or even just crutches or a cane, it can be difficult to get by multiple barriers. Many of the disabled don't want to be made a spectacle of, by requiring extra help. They just want to come and go with as little notice as possible. They want to enjoy the same things normally mobile people enjoy, like a dinner out with their family or friends.
Something tells me that if some of the business owners were to become wheel chair bound, but could still work, except for access problems, they'd find a way to make the necessary changes to their place of business.