So you think the mini is not going to be an option for people who don't like Windows 8?
If they are looking for a mobile/laptop solution then, no it won't be an option. Most PC users are looking for mobile/laptop solutions. Just look at the numbers of what people actually buy.
Similarly the folks looking for an xMac (headless iMac ) with a couple of PCI-e slots for higher end graphics are not going to buy the mini either.
There are some that are going to buy the mini. But the point is to look at what most people are buying.
Most people are buying mobile solutions. Mountain Lion's and Windows 8 skew toward making that sort of hardware more effective to use perfectly aligns with where the overall market is heading toward. Windows 8 also has features for the classic "box with slots" hardware but it is not what folks are yelping about.
Mac is already gaining market share, and has been increasing sales at 25% per quarter for a very long time now (years, something like 20 quarters or something?).
Up until relatively recently the overall PC market has been increasing. Apple going up while the whole market is going up typically lead to them treading water with perhaps relatively small (to overall market) gains.
Recently the PC (classified without tablets) market has gone flat. In that context Apple has been largely stealing share from other vendors. That is a zero sum game. At some point, unless the overall market starts growing, they will hit a wall in the next several years.
the abomination that is Windows 8 could well be the thing that pushes a lot more people over the edge.
Except Windows 8 isn't likely to push folks over the edge who are heavily wedded to either vendor diversity (which OS X offers none ), costs (more affordable PCs ) , or Windows infrastructure ( rip out AD , CIF/SMB , IE5 web apps , etc. ).
There are PLENTY of Windows XP hold-outs who refused to upgrade to Vista or 7. Windows XP runs out of extended support this year, and new hardware won't support their OS next time they upgrade PCs.
First, Extended XP runs out in 2014
http://support.microsoft.com/lifecycle/?c2=1173 (for USA users at least).
which is sufficient time for Windows 8 to get its first Service Pack if not get to a stable point release update status.
Second, it is primarily Luddites (or stalled hardware upgrade cycles ) that aren't moving to Win7 from XP. Many of those folks frightened off of Windows 8 will likely be able to optionally choose Win7. Vista ... yeah no one is going there, but Win7 wasn't that bad. It is at close to 40% of the Windows market right now. It has done a good job of killing off Vista and serving as a destination for XP users willing to get moving. Between Win7 , Win8 , and Mac OS X which OS has the closest application compatibility with XP ?
Third, anyone looking for 10 years of OS support isn't going to find it at Apple. Your assumption is that folks who want to cling to an OS as long as possible (e.g, XP users ) will jump to Apple in large numbers. That assumption has huge holes in it. Huge.
I'm not saying it WILL happen, but there's a half-decent chance.
I would put the chances at slim. Win7 deployments will probably continue to grow. The combination of Win8 and Win7 growth will likely relatively rapidly shrink the XP market share over next 2 years. OS X will snare a larger fraction of the "significantly above average selling price" PCs but that will remain a sub 10% share worldwide.