Apple will not drop Intel because it would be a dumb business move at this point even if it could run Mac OS on ARM.
Apple believes that the desktop PC sales as we know it will decrease in the future as sale of iOS based devices surge.
They are not worried about CPU or GPU for desktops because they will not sale so many of them.
Moreover, Intel + AMD + Nvidia facilitates running Windows + Linux etc... in VMWare Fusion for example.
Apple needs to become just as Swift...