It doesn't matter.. 80% of their revenue and value comes from 2 products..iPhone and iPad. This is what their current value is "based on". Without it, they wouldn't be worth squat.
yeah, in early 2000's it was the ipod, they knew it and they knew it wouldn't last so they segwayed to iphone and ipads, while simultaneously increasing mac and itunes hardware sale *and* cracking the PC deathgrip in enterprises. leave aside the fact that because the hardware is so expensive and continues to outsell cheaper PC alternatives, the company makes *more* money PER PRODUCT compared to all alternatives that are sold. and most of all, they had over $100 billion sitting in cash to do whatever they want with it.
you do realize this isn't like an investment portfolio where you want to have diverse products simply to mitigate your risks?
most businesses have their flagship product aside from whatever else they sell, many only have 1~3 products to offer. the idea is to do few things really well as opposed to a mediocre job at a ton of things.