For a mathy discussion related to this topic, I ran across this interesting and depressing paper a while ago:

http://www.danielsusskind.com/research

The depressing conclusion: " In a static model, increasingly capable machines drive down relative wages and the labour share of income and force labour to specialise in a shrinking set of tasks. In a dynamic version of the model, labour is driven out the economy at an endogenously determined rate, forced to specialise in a shrinking set of types of tasks, and wages steadily decline to zero."