22july2013
Apps aren't the only thing people may buy using China's digital currency. Any American who wants to do business in China may be forced to use that currency when they travel to China. Apple does lots of business in China, don't forget. Apple employees who travel to China would all be impacted.
Also, if third party app stores become something that Apple has to allow, how is Congress going to enforce their current proposal? That would be impossible. It's possible only if the App Stores are controlled by the device manufacturers.