No, we should look seriously at whether we need to keep doing things the cheap labor can't perform anymore.
Supporting IE6 is a Black Art, and keeping people who can perform Black Arts reliably is expensive. I suppose the traditional comparison is to COBOL codebases and greenscreen IBM development. If thinking about that convinces you IE6 isn't the mainstream anymore, go for it. The point is that increasing the number of different, and I mean really different, browsers your team has to know about is not free, as the cheap labor only knows the relatively tight cluster of post-IE6 graphical browsers. The article's the evidence of that.