Originally Posted by
I-Like-To-Bike
What makes you think so? Do you have (m)any U.S. cities in mind that are getting "denser" or more "compact" as measured by any credible set of metrics?
No. Urbanization will continue so cities will grow and most cities will meet some natural barriers if they keep spreading out. There's also the nature of cities, they work because travel distances/times are limited. Otherwise buildings would be much more evenly spread out over the land.