Corporate users who can't update their browsers because of some persnickety internal application they have to use, but who then go and use that same browser on the public Internet. By unleashing these obsolete browsers on the world at large, these corporate users make the Web worse for everyone. Web developers have to target the lowest common denominator, and the corporations are making that lowest common denominator that much lower.
And the best way to resolve that is to alienate the enterprise even more . .
At least at the end of the article, the author discusses having enterprise releases and internal updates. But the kiddies running this show need to realize that the big boy adults (i.e. the enterprise) are going to be the ones that drive the significant majority of sites/work on the web. Just saying, "oh go away I don't want to deal with you" only leads us right back to supporting IE6.