Earlier quoted context omitted.
Just out of curiosity, what is making you move towards Linux? The huge appeal of OS X to me is, as someone said on here recently, it's basically *BSD with a fancy window manager and 1-to-1 hardware/software integration.
The way OS X is being locked down. In 10.8, signing is optional and even if you tell your system not to allow unsigned, you can bypass it on a case by case basis. In the next OS X, we'll probably move a bit farther in that direction, and at one per year, the OS X of 2016 will probably refuse to run unsigned applications at all, for excellent reasons involving security and malware, etc. I'm sure there will be a way to…
What would you have them do instead?