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I wouldn't imagine porting OS X to ARM would be the hurdle as most of it is already done in that iOS is most of OS X. Apple has full control of that source code

I wouldn't imagine porting OS X to ARM would be the hurdle as most of it is already done in that iOS is most of OS X. Apple has full control of that source code base and probably already has done this, like they did during the transition to IA-32. It would be the third party applications that would be a hurdle. Without a transparent layer like the deprecated Rosetta, they would not be able to run existing applications and would have to explain that a new MacBook Air can't run all of the old MacBook Air applications. Maybe if they come out with an ARM powered laptop, they will call it something other than MacBook Air to avoid that confusion.

gonzo 13y ago
Just the Apple Air, I'd bet. Don't forget that Apple has spent years getting everyone on Xcode, and disciplining them to avoid the parts that would make a recompile & test straight-forward. They also have a "good enough" office suite (for many people), as well as the iWork apps. Such a device could potentially also run iPad apps without much change.