He means that since it is Unix based, that it be "ported" to the Intel i386, i586, i686, the duo cores, the dual cores, the AMD processors, that it shouldn't "just" run on Apple motherboards. I'd be satisfied if it would just work on 100% Intel motherboards. But many people have Asus, MSI, et. al., motherboards, and they usually have different Raid controllers, PATA and SATA controllers, audio, NIC, etc. And Apple really doesn't want to support that - they want to sell their own hardware. And there's the rub.
Me, I run OSX 10.2 on a g4-500, Ubuntu & XP on a 3GHZ P4 Northwood. I'll be buying Leopard when it comes out. A full featured OSX is cheaper than the full featured Vista. Would I want to make OSX into a Media Centre? No. But I wouldn't want to make the XBox, 360 or PS3 into a Linux box either. If it is a matter of secure surfing the Internet, I'll use OSX and Linux over XP any day. But I still need XP for gaming. And gaming is the OSX's, and Linux's, weakness. I guess Vista really needs to run a Linux virtual window running the browser under VMware, but that just exposes Internet gaming to hacking and cracking since its connections wouldn't use the VM layer. But it would be interesting to see if IM could be stopped from being a conduit for crackers if it can go through a Linux VM window.
Me, I feel that there are things which OSX can do better. And these weaknesses would become apparent the second a Windows based user tries to install an .exe to get some functionality from their favourite picture, video, audio shareware app. Since most people are not used to using multiple desktops, this isn't a "biggie," but its been driving me nuts forever under OSX 10.2, as has the picture preview where a small picture of the picture is not shown in the desktop window.
OSX is not perfect, but a lot of people may want OSX just because you can buy it for $129.99 instead of $299.99. The problem is one of support though, as most Windows users are used to getting over 5 years worth of security updates from MS. You'd have to pay with OSX. Are they ready for that?