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That would be an absolute nightmare for app developers...I think Apple will most likely convert the whole Mac line over to ARM in a single release while maintaining some kind of translation or virtualization layer for apps that need to run on the "old architecture". They did it before with Rosetta: http://en.wikipedia.org/wiki/Rosetta_%28software%29

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Maybe if all the apps were coming from the Mac App Store. I think the limits of Sandboxing have slowed that progress significantly. They should have reasonable allowances to bypass the sandbox for apps that really do need the entire machine. Instead we are now so restrictive a text editor isn't feasible and the Mac App Store is faltering.

http://www.panic.com/blog/coda-2-5-and-the-mac-app-store/

PS-I don't think they will switch to ARM. The new USB-C MacBook is very power efficient.

Universal binaries, or otherwise VM-based approach with JIT. I think Swift is moving in that direction. Just imagine you have pure Swift with no ObjC or C code allowed: the compiler will be able to easily build a VM binary that will be JIT'ed on the machine.

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