I seriously hope this becomes a worldwide trend, I am more than fed up with supporting IE6
I’ll second that emotion.
On the other hand, billable hours is your friend. For almost two years I’ve been charging a rate to build sites that are, first and foremost, XHTML and CSS valid (which, for the most part, is not so difficult in Safari and Firefox, Mac or Windows). Then, there’s an add-on charge for getting the site to work with MSIE 7.x, and a separate charge for getting the site to work with MSIE 6.x. In some cases the add-on charge is equal to the original site development.
Billable hours is your friend.