[dsr_]

The "writing on the wall" refers to the story of Belshazzar's feast. Belshazzar throws a particularly blasphemous party, and a hand appears and writes "mene, mene, tekel, upharsin" on the wall, which the prophet Daniel translates as "weighed, weighed, found wanting: divided!" and means that the rule of the Babylonians comes to an end and the Medes and Persians will split the kingdom.

In other words, seeing the writing on the wall means that you have failed and will lose what you have.

ARM, in this context, means the processors that power Android phones, iPhones and tablets of all kinds. ARM is the designing company; many other companies license the design.

There is a lot of speculation that Apple will quit buying Intel CPUs and move to ARM CPUs, because Apple makes ARM CPUs.