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.
The problem is what could the others do? It seems all they can do is depend on Microsoft getting their strategy right.