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Apple has done this before for PowerPC software on Intel hardware and Microsoft is doing it right now for Intel software on ARM hardware: Compatibility modes (or how you'd call it - they enable the software to run without modification, albeit at lowered performance).

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When Apple did the PowerPC -> Intel switch, they were going to a higher performing CPU, so the efficiency loss in having to emulate was somewhat offset by the higher performance processor. In this case, they will most likely be taking a step down in performance, compounding the loss of efficiency in having to emulate.

Yet Apple has enough ecosystem power to force most developers to switch quickly. And if they don't the worst customer complaint will be the app running slowly. But I'd expect them to release a tool chain months before they start selling an ARM mac.

Plus, the Mac App Store makes this a lot easier this time round. Apple will have a big "optimized for Air" sticker on the App. 99% of common apps will switch in no time.

Also a reminder that NeXT had this years ago. It’s just nice to see all this stuff coming back.

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