Based on browser usage statistics, if one were to not take into account IE6, you’d be abandoning an entire quarter of internet surfers, which sums up to having possibly 1 potential user of every 4 whom might encounter display or accessibility issues with your website.
I do agree that designers have an obligation to help smooth the process of browser transition, but I don’t think that should be emphasized or made a priority as long as their is still a large demographic of users using it. Rather, our jobs should be in catering to this audience than to leave them in the dark. One of the main objectives of a good design is to provide a good user experience, whether it be through visuals, content, or just even through accessibility. Granted, some of this sentiment doesn’t and probably shouldn’t represent websites that promote or encourage the use of cutting-edge technologies or motion graphics to enhance visual appearance and interaction. An example would be promotional websites for film or something like a new line of shoes from Nike, which either probably generates its dominant audience from other forms of mediums or doesn’t care much for compatibility because interactivity and motion-graphics may outweigh the importance for marketability sake.
Certainly I’d love for IE6 to be totally phased out, but that doesn’t mean we should forget about these users. That’s stupid business practice and part ignorance for certain.
The proper way of going about this is to just let it phase out over time.. Let the more ignorant designers or amateurs whom aren’t as aware of cross-browser compatibility or don’t practice it all do the job for you in making audiences suffer from IE6. You, as a professional on the other hand, shouldn’t let your clients suffer from a belief that they otherwise, may not share.