haven't you heard? next MacBook Pro will have ALL INTEL, no more discreet NVidia GPU. That does not sound like the are moving to arm anytime soon. As for work stations, are they going to put a puny arm chip to run all the process-intensive programs demanded by current users??
Good answer! Intel has a much more deeper relationship with several hundred Intel employed engineers working at the Apple camp with Apple's engineers to build future products using Intel chips. So far it looks like Intel's camp is succeeding in coming up with top line products with Apple, while any ARM based camp is stuck in the same old process that's keeping their hands tied behind their back. ARM had one thing and one thing only on Intel in the past. A longer battery life using their chips. And now, Apple has a powerful Mac Book air that gives as much as 13 hours battery life using Intel chips while their much weaker iPad which is more like a toy using ARM based chip, still stuck at 10 hours battery life.