Long term, the PC and workstation will wither because computing access will be everywhere: in the walls, on wrists, and in ‘scrap computers’ lying about waiting to be grabbed as needed.
The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it.
Machines that fit the human environment, instead of forcing humans to enter theirs, will make using a computer as refreshing as taking a walk in the woods.