What kind of security would be available for NFC functionality? Would the person making a purchase need to input a PIN or password prior to the purchase going through? If so, there is the potential for it to be more secure than a physical credit card.
Apparently, just as with credit cards, below a certain amount no PIN is required at many stores. Above that, you have to enter one.
In my experience, it seems that there are fewer measures being taken to confirm that a person using a credit card is the owner of that card. As an example, I recently found out that my credit card company is flagging all purchases at Walmart over a certain dollar amount as potential fraud. The reason? Walmart isn't doing a very good job of checking the ID of a person paying with a credit card.
No kidding. Earlier this year one of my credit card bills had an extra $400 of purchases from a Walmart far away. Of course, they took it off my bill as soon as I called and explained it wasn't me. Obviously my CC number was cloned at a restaurant or gas station. This could not have happened so easily with an NFC-only account, because the thieves (hopefully) wouldn't know my PIN.
I keep saying that the real wallet killer will be when we can carry our driver licenses on our phones as well.