Not necessary to do that. In order to use it, the app has to be unlocked with a pin. That's more secure than checking an ID against a physical card. So in essence it's no different than them not checking ID when you use your card as debit (since they assume since you know the pin it's your card). NFC is much more secure than a physical card.
Note: You didn't see a pin entered on the app in the video because I set the app to stay unlocked for 30 minutes after pin entry (didn't want to be entering a pin on camera).
And this is why it won't get widespread use until people are forced to (do you really have to enter a pin in first? I personally like that, don't get me wrong, but i work retail and you'd be amazed how lazy people are).
People don't like having to remember a number, that's too much work. Why do you think the credit card companies (unless forced) just want to use signatures? Because it's quick and easy and painless for people. Hell, they are making it more painless for under 25 you don't even need to sign. And the credit card companies are in the business of convincing you to use your card as much as possible. So they always are going for whatever is the path of least resistance to allow people to do.
I see so many people who don't bother to remember their pin (They just use their debit like a credit card) or who get pissed off at having to remember a pin. Hell, if they haven't signed their card and I ask for ID I get lots of grumbling about that (just for the few seconds it takes to get an ID out).
Don't get me wrong, I personally would like the US to go the way of England, where everyone uses a pin for their credit card (the CC companies don't though). I just think looking at the general populace, you won't make a technology popular if it involves them having to remember a pin when they can just take out their CC and swipe it.