On the other hand, their A10 chip is roughly on par with the performance of the Intel chip they include in the 12" MacBook. They're not going to replace an i7 with an A10, but maybe replace the M3 or M5 with an A10, replace the i5 with an A11, and shoot for the i7 with an A12 or A13. Why else would they dump so much money into making the fastest ARM chip on the market? The iPhone doesn't need that much power, but they keep pumping it up anyway.

We all know OSX will run on ARM, they just use a different WM and call it iOS.