What about the rumors of Apple making their own modems? Isn't that why they've been making the A series SOC chips? In order to better control quality, performance, battery life, and cost? Just integrate the modem into the SOC, or at least onto the same package. Do some sort of system-in-a-package
I think people forget that the X86-64 specification can be licensed. Apple could simply be licensed by Apple and integrated into A series chips for the Mac. Then that would take care of the compatibility issues and virtualization issues