Of course VZW isn't going to switch its network to GSM. Apple will make a CDMA iphone, simple as that. If HTC can have CDMA and GSM versions of the same handset, I'm sure apple engineers can figure it out too.
There are more CDMA customers in the US than GSM. There's no reason why there can't be a CDMA iphone. The only one I keep hearing is that apple wants iphone to be exclusive and limited. Yah, I'm sure the shareholders will be just fine with that.
You're thinking local. There are many more GSM customers WORLDWIDE than CDMA. In case you haven't been reading the news...iPhone is debuting in 22 countries around the world. The US is just one of those. For the record...I did not say they couldn't build a CDMA iPhone, I said I feel like they wouldn't.