Hi owenransen, I'll bite on your question, I don't think it's a matter of people not caring about being able to convert LAS to DXF, more that DXF is a CAD/drawing format and not a true remote sensing/GIS format. CAD is used more for drawings and dafting, not data creation or analysis, I mean that the DXF format and associated programs were never designed to view massive datasets all at once. I would never look at a LAS file in AutoCAD and expect it to draw quickly anymore than I would expect ArcGIS/MapInfo/ERDAS... to be capable to draw arcs, lines or polygons with the precision and survey grade accuracy of a CAD, they are designed with two seperate paradigms, one is fine scale hyper accuracy, the other is more regional...
Hope that clears things up a bit.
S222