Well put.
I would also argue that we need measures of human progress other than productivity per person. For one example, with each generation pay ditch diggers more to do less work, and by that standard we are woefully regressing.
Someone posted this the other day, which I'd never read before but I thought was quite an eloquent argument for the same. Bertrand Russell, In Praise of Idleness: http://www.zpub.com/notes/idle.html