Of course the whole color mapping thing would have no benefits to someone who was blind.
Then we'd have to require all the electrical maps to have braille
The question is, where is the line drawn between the rights of business owners (not government regulated occupations such as an electrician or medical transcriptionist) to pick and choose their clientele and the rights of the disabled in their "pursuit of life, liberty and happiness"?
Not being able to shop at Target will not kill you. Bad wiring or the wrong prescription will.
There should also be some exemption criteria placed in the law as well though, or at least some kind of extension process. As mentioned some people who own commercial websites are just not tech savvy, and considering their financial status at the time they may not be able to hire a web developer to make changes. Obviously as a web designer I am biased and think it's a walk in the park. Others aren't quite so lucky so you have to give them the benefit of the doubt.