If you build websites for business, sooner or later the folks whose money you took will probably get email from someone who wants to buy your client's stuff, but can't because you made a decision not to make their site accessible. These regulations point to a new era of website development. Governments will do it, because it is our tax dollar. Companies will do it because it is a bottom line issue. You will do it because you love a challenge.
Accessibility is more work than that.