This is an oversimplification -- many (if not most) PCs are superfluous, but this is because they belong to people who do not need a computer at all. Even with

This is an oversimplification -- many (if not most) PCs are superfluous, but this is because they belong to people who do not need a computer at all. Even with them all replaced with tablets or whatever, PCs will still live long and prosper in their original niches.