Hi I've been away a few days and so have just caught up on the discussion. I think Victoria Satta's comments on the inevitability of ICT producing efficiencies in education are well-founded. Indeed, the evidence from the Industrial Revolution onwards is of such efficiencies through the application of technology.
Education is one of the last sectors to be affected.
We are at the innovation phase of the curve, before mass-production. At the innovation point the products are produced with a lot of skilled labour, and have a premium in value. Once the lessons from the innovation phase have been learned and applied to a 'massification' we will see a rapid fall in unit costs. The application of the 'production function' to educational methods is another analytical tool. But anyone arguing that there is no serious evidence of efficiency gains is really sticking their neck out.