Right now, Amazon has an incredible way to market the kindle. It doesn't require a computer or anything from the owner (beyond an outlet to charge once or twice a week if you have EVDO on OR once or twice a month if you dont).

This is something that very few, if any other companies can claim. Not even cell phone companies can claim this - Verizon needs AT&T or Sprint or whoever in order to allow people to talk to everyone else.

Adding wifi support removes this claim - you're now dependent on the person's ISP (internet connection), router manufacturer (provides the wifi) as well as a few other misc things. That takes away from the simplicity of the device.