Too hard to tell now. However, If Apple does implement the technology, that would go a long way to making it become a standard, thus making it become more and more useful over time. Looking forward, it's only a matter of time for something like this to become ubiquitous, that's obvious.
Android has had NFC-enabled devices for a while, but those devices only have a thin market share. The problem is finding places that utilize it. I think if iOS adopted NFC it would become more widely used and that would be fairly useful for me.
Do they sell RFID shields with tin foil hats?NFC credit cards are super dangerous. Some website demonstrated by having a guy walk around with an RFID/NFC reader hidden in a regular iPad case. He would just walk by someone's bag, and he would have all credit card data. As it was a demonstration he would then show people. There's a vid somewhere but I can't find it.
Bottom line - always use an RFID shield if you do get an NFC enabled card.