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One of my boss +Eric Schmidt's favorite phrases "these are platform wars". Nicely summarized in the Graphic from the Economist article below.
A history of personal computing A GOOD way to think of the computer industry is to see it as a series of “platform wars”.
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The problem with the "platform" wars is that this "platform" comparison is comparing apples (base station + laptop) to oranges (tablets) to pears (smart phones) - yes they're converging in many ways, but they serve different purposes and people do use them in different ways.

I do agree that it's war between platforms. . . I just think the infographic is unclear and not very revealing of anything concrete. "the PC's dominance in the computer industry is coming to an end" - really? Constant up-slope (even in a logarithmic scale, which is deceptive itself) and completely different purposes.

The one thing that seems clear is that Personal Computers (Macs/PCs) are still selling (and take into account the scale, Macs aren't increasing by as much as it looks like they are) while Personal Devices (i.e. phones/tablets) are exploding, which is not unexpected as they are something that a family will have many of. My family has five Personal Computers (I have two, one PC and one MBP, the rest have a laptop each) and 7 or 8 Personal Devices (iPad, Fires, Kindles, Android, WP7) which makes sense since if we had that many larger devices, we'd be BURIED but PDs are easy to tote and store. . .

Yeah, the one thing (the more I think about it) that makes sense is that this infographic and its accompanying description is pretty much useless - just headline pandering and sound-byte reporting.
To a small extent - but you don't do your financial reports or type your monthly reports on your phone. Significant content creation still happens (and will continue to happen) on something with a decent screen and keyboard; significant design still happens with a decent set of input devices.

All that's really happening is that purposes are dividing - content creation is being divided into serious and casual. Casual can happen on a personal device; serious (i.e. content that requires detail and time) stays on the desktop. We're still talking apples/pears.
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