Interesting observations here. I can see the possibility of the MacBook line moving to ARM and iOS10/11/12 in the relatively near future. Essentially mimicking the evolution of the Newton from smaller handhelds to larger handhelds (MP2000) to a keyboard based device (eMate 300)
The main use case for a desktop/laptop machine isn’t Word or Photoshop considering some of the excellent work done by Microsoft and Adobe, it’s actually developer tools. Developers are still forced to use large machines to produce the software we need. I wondered at Unity 3D a couple of years ago when they started offering Cloud Build and obviously it’s not a stretch for Apple either.
Plug your iPhone into a massive screen, attach a bluetooth keyboard and cloud-build your apps on Xcode Go.
( Is it not crazy that on Monday we will see the announcement of iOS 10? )