No, thats a very good question and honestly I don't have the answer to that.
To be completely honest, it amazes me that aapl has continued to grow at this pace. I worked at BBY for several years and the whole Ipod craze has died off a long time ago. That wasn't just in my store either, but throughout the whole district and most likely the whole country. The last 6 months whenever a customer would come in to buy an Ipod they were just replacing it.
Whenever I go into an Apple store they are always busy, but I rarely see people buying stuff. Apple is in the process of introducing a lot of new products but I don't think they will be such a huge hit as the Ipod, so I don't think they will be able to hold up earnings. The iphone doesn't come out for a while, and I have my doubts on that, so the only thing I can personally see keeping the stock up is hype.