Brad Russell
The PC market overall is in steady decline as consumers are opting for portable devices. What's left is the business user, proprietary industrial machines, data centers, and content creators. As the PC market has been in steady decline, Apple's market share has steadily been increasing. They were at 13.7 % over the holidays. They were number 3 among PC manufacturers but saw a 28 % increase against #1 HPs 10% decrease. Dell and Lenovo were up a little, but Toshiba was down 13%. Smaller manufacturers were down 30%. Consumers who are ejecting from the market are overwhelmingly windows users.
Not sure where you got those figures...I could imagine Apple market share of
shipments going up during the holidays, but the picture for 2013 as a whole up to 4Q is somewhat different...
http://appleinsider.com/articles/13/10/09/mac-shipments-continue-to-shrink-as-apple-loses-ground-in-us-pc-market http://www.macrumors.com/2013/10/09/apple-again-trails-u-s-pc-market-in-key-back-to-school-quarter-as-tablets-continue-to-eat-into-pc-sales/ But this is the one that's really revealing, as it shows which operating systems are most common on desktops.
http://www.netmarketshare.com/operating-system-market-share.aspx?qprid=10&qpcustomd=0 It's interesting that Windows 8, 8.1 and Vista combined have less than half the share of Windows XP...
[Edit: The link above seems to be dynamic, as it's to a subscription service so you get something different every time you click on it. I got to the most recent figures using google - try "Desktop Operating System Market Share" and look for an entry with "NetMarketShare." Good luck!] But let's look into the future. The desktop, Mac or Windows, is on the way out because it's overkill for those who find tablets and smart phones do what they want. Windows desktops rule in the corporate world, but are of lesser power, and backwards compatibility is essential. Apple's desktops have a huge presence in audio and video, but the price paid for that in terms of selection and backwards compatibility are well-known.
I predicted years ago that desktops would become less common, more powerful, and more expensive. Apple's Cylinder is exactly that. The company is clearly producing a spare-no-expense, high-power desktop for crucial creative applications. However, the fact remains that not all movies are made in Hollywood with big budgets, and quite a few music hits are made by remixers in a bedroom with a laptop. Ultimately, I think Apple's
desktops will have an increasing market share of a decreasing market, and in the ultimate paradox, the Windows desktops - which will nonetheless offer considerable power (arguably without Apple's cachet) - will become "the computer for the rest of us."
That's my story, and I'm sticking to it.

Sure wouldn't mind if a Cylinder dropped out of the sky, but the price tag doesn't make sense for me.