>When I'm stuck in the wilderness with nothing but an atom based netbook tethered to a patchy and expensive GPRS connection, I beg to differ.
Who cares about outliers like that? How many people using your webpage are connecting like that? 1%? 0.1%? Less? Are you really going to make major decisions based on 0.1% of your users?
Know your audience, I think, is the most important factor when deciding how to go forward.