Human children have the great benefit of interactively learning from their parents and other humans raising them. Could we expect a child to learn to speak if they only heard recordings of existing speech with otherwise no human interaction/feedback - correcting them or offering customized and contextual new bits of information? It would be interesting to add feedback path for human corrective input. i.e. because it's direct interaction, feed it back but somehow weight it a little more than just another corpus input.