True, I guess it comes down to how much use is transferred to mobile devices. I'd say very little in the home where the PC lives. I gathered that post PC was when takers arrived and took off. A tablet is a PC, although not in the traditional use case, although no doubt some low/basic users would use a tablet instead. Game consoles reduce PC usage also.
What uses would you use a mobile device for at home instead of your PC? I can only think of email if the PC was off at the time, although my rMBP starts to Safari, internet on, in 12 seconds.
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I hear you, but the user of a mobile phone doesn't buy it, or prefer to buy it, based on a Profit and Loss Account from a corporate. Lets say a Galaxy S5 was superior to an iPhone 6. Or as good. Or not quite as good, but a little cheaper, making it a viable purchase. In my anecdotal example, these two phones are equal. Monthly sales may be equal. Profits are much different from Apple and Samsung mobile divisions.
A disclaimer is that the 93% is partly due to higher sales this quarter, due to a new release. Next quarter, iPhone sales will ease, but if the S6 comes out, that will have a sales spike. So, I don't buy into profits being market share, or quarter sales as above, we need to look at the year on year, when any new phones are included. The cost/profit issue is down to the company to resolve.