Great analysis as usual from Horace Dedieu:

The real problem for the PC vendors is not that they have such low margins–they’ve had low margins for decades. It’s that the volumes which “made up for” low margins are disappearing. Apple is not immune to a gradual erosion of Mac volumes, but they have positioned themselves for growth with devices and content commerce and services. They have essentially “escaped” PCs and indeed caused the need to escape in the first place.

As I said recently, all the PC vendors are slipping, but only one is really building an alternative.