Best quote ever? Jobs flying to NYC to hire hit man to 'eliminate' conducting iPHone users.
Seriously, most, but not all, iPhone users are probably planning to buy cases anyways. If you go naked, just mind the gap with your finger and you be find. As the joke goes, "Dr, my head hurts when I hit my head with a hammer. Dr: Well don't do that."
As Joe Stalin once said from Russia, " where there is a problem, there is a person. When there is no person, there is no problem"
Perhaps we will see a lot of films like the screen protectors coming out that just wrap around the metal bands to eliminate the problem without any bulk.
But you will still affect the RF signal just by picking up the phone, as any phone has this 'issue'