My impression was that traditional cities are higher density than modern cities. They're less dense than hypertrophic cities like Manhattan, but almost everywhere is.
Paris is 9 times denser than Atlanta, for example, according to Wikipedia. Can you cite any statistics showing traditional cities aren't dense? You might be right, but any place I've looked at that's traditional is also rather dense compared to the median city.
http://en.wikipedia.org/wiki/Paris http://en.wikipedia.org/wiki/Atlanta