if you read the article in AEC magazine, it actually presents quite a good argument for dwf, and details the limitations of pdf... just because it is the standard approach doesn't mean that it is the best... dwf is smaller, and will soon be able to support 3D models...
anyone who is mac based and has to deal with the majority of the rest of the deisgn community on pc, using autocad, microstation, archicad etc will know all about the problems file sharing...
we are under so much pressure to change (and conform) that the only thing that might delay the inevitable is if programs like VW try and improve not only their product, but also their ability to snyc with other pc programs...
dxf are a waste of time...