[chkuendig]

There's a big difference between Motorola and Intel: This time around all their competition is also stuck with Intel.

Switching to Intel guaranteed that they worst-case will always be on par with their competition. They'd lose that if they switch away to custom built silicon.

Now if ARM would start to make serious inroads in the Laptop/Desktop market that might change. But then again, thanks to P.A. Semi Apple has more than enough ARM knowledge already.