Because their customers are happy with their coverage? I would certainly not want them to switch. I love their coverage, sadly don't travel overseas, and very rarely feel any need to talk and use data at the same time over 3G. They're not going to build a new network from scratch just to lure the iPhone, especially with the success of Android.
The whole debate is practically over anyway, because 4G looks like its going to be focused on LTE across the board, although WiMax is kind of the CDMA of that battle. As far as I know, both AT&T and Verizon are looking at LTE for their 4G networks.
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