I think Kay believes that the scale of our current industries are a lot smaller than they could be.  That the reason that they currently require us to divide our labour so extremely is incidental complexity we have built for ourselves in 60 years of small, short-sighted steps.  If we could slow down and think about how to simplify what we are doing, each person should be able to handle large chunks of our current industries and together we could move on to more interesting things.  Instead of struggling to reproduce the functionality of a WYSIWYG document editor from the 90s in HTML5, maybe we could move on to more easily create new classes of software that do not resemble what came before.