Isn't it all about having a point?
Paper magazines have a set agenda and a identifiable audience, they serve a set purpose. It is therefore far easier, as a writer, to write a piece which answers a specific question or addresses a particular issue. Internet articles generally have no such fixed targets or enforced agendas and so, depressingly, result in a rather muggled aimlessness.
Magazines such as AP managed to combine the two, just take a look a Digiworld to see what happnes when all constraints (and therefore) targets are removed.
Rebels only excell within a system which prohibits them.
The people who should be writing for paper base magizines are sidelined into obscure websites...or else I wouldn't be sayign this here.