This is a rather pointless debate but I have to agree that OSX is getting too "consumer" for this audience. I have a Thinkpad and it runs Linux great. A lot of the problems people here refer to are really where they should be on a consumer operating system. I've noticed this over recent years, hiring new intake from the top schools every year has seen a change. When I ask them what they want for their development machine. It used to be Macs with a sprinkling of Linux/Thinkpad but now I see most going for Windows 7. Since all of our software is linux based the client machine only needs to be able to run ssh sessions but it's interesting how many hard core developers want consumer operating systems. I'd not dream of doing work anything other than a Unix system, but maybe that's just because I've grown up with it. Starting out with HP-UX on HP-9000 machines, Apollo, Next, NetBSD, Netware, etc etc. When my machine doesn't work the way I want it I generally know how to fix it on Linux. For the majority of people using a consumer operating system that has nice gui tools for changing things is usually better unless you know what you're doing.
Coming back to ditching OSX, the recent Chrome/Netflix ability has made a big difference for me. That was the one last thing that was a pain, it was always possibly, but not always very reliable and a little tedious, but now there's nothing left (besides of course Photoshop) that doesn't run on Linux. It's really less about the operating system and more about what you want to run, if it's games then windows, if it's designer/photographer then OSX, if it's nerd (git/gcc/python etc) then it's linux.