re: Is that why...
I think a camera would be a nice addition as would GPS. I would love to be able to use my wife's fire as a GPS unit while we are out driving. You can load the navigation data before you leave, or tether it to a smartphone if you can. The larger screen would be nice for that. As far as the camera...it would be good not only to just take pics with, but also for video chats and apps like skype.