It's less clear how NFC could be deployed more generally. Obviously, any institution (hospital, university, large corporation) which serves enough people consistently will be motivated, over time, to deploy this kind of system. And it's not hard to imagine chains like Starbucks, Dunkin Donuts or McDonalds which already offer reloadable store cards and associated mobile apps going down a similar path. The ability to offer non-cash payments without the massive fees associated with small charges is compelling for large chains.
These kinds of systems have the potential to push the world even further in the direction of chain standardization. The single-shop and small chain is going to be a tougher nut to crack.
And while it's easy to wear the Disney band on vacation, I don't want to have a whole bunch of bands. If NFC payment takes off, it's either going to be cards in a wallet (since we all do that anyway), or we'll need a device flexible enough to represent all the different NFC standards.
Cue paranoia about people stealing your data or stalking you -- then think about how amazing it would be to never have to worry about misplacing your kid on vacation again. Not to mention how fabulous it would be to lose your payment media, be able to turn it off within five seconds, and activate a new payment form a few minutes after that.
ETA: A humorous opinion piece on NFC and SmartWatches: