Honestly they probably want virtual sim less for control and more for lowering manufacturing costs. If they could have the same case and board design for both GSM and CDMA phones, they’d save a bundle. They also might be able to make the phone a bit thinner without the sim slot.

That said, one of the good things about GSM is network portability. If that becomes difficult or impossible with the iPhone then it’s just another network locked phone; Not that unusual in the US, but annoying and terrible everywhere else.