@ValueInv, yes you've definitely nailed some of the points I was trying to make with my inversion of Uccmal's bear case to see whether the business' growth is actually sustainable. On the other hand, when we're inverting, I guess we also need to invert the bull case. What would need to happen for Apple's growth to be unsustainable?
How would we think about the business:
1) If Bill Gates goes back to MSFT and it's the 90s all over again? (Not possible.)
2) If the current team at Apple fails to out innovate its current competitors? (Hard to see, there's a small leap of faith component here, since we don't know what they're really working on and what competitors are working on. We can only see the incremental innovations of the past from the current release cycle.)
3) If a competitor, like MSFT or Google, creates an equally innovative OS and the "commoditization" of hardware drives down the price of handsets?
4) If the switching costs of competitive products are equally high? (I have a Windows PC + X Box, maybe I'll get a Windows Phone once a decent one comes out. Or Google Search works better on an Android.)
For me, this goes into the "too hard" basket, although I personally think the bull argument is a lot stronger than the bear argument. I buy the whole "Apple has a superior ecosystem argument" which is especially true in a growing global market, this could potentially be just the tip of the iceberg. (Then again, I take myself with a grain of salt, 4 years ago, I probably also thought RIM's powerful Enterprise Server + BB Client business was a superior ecosystem.)
That's the hardest to say. I mean, there will definitely be tremendous amount of competitors targeting this space, but to succeed in capturing share from Apple it'll require a combination of superior vision and execution. If Apple has assembled the right culture and team, it would potentially be possible for them to defend against new entrants. I mean, maybe Jobs has figured out the secret Coca-Cola recipe for tech/product R&D success and maybe it tastes like an Apple?