I think Vivian's points are all very accurate. I would add that an equally intriguing question is, Who is asking for e-learning and why? As Buell and Anderson point out in their lit review, we need to understand the nature of our biases toward e-learning. I think the onus is more on us (as practitioners or theoreticans) to make the argument, than it is on those who seem to resist e-learning in one way or another.