Density makes a place vibrant. Density makes a city work. Density is the word and our answer to make better communities. Holly Whyte said "we are going to have to work with a much tighter pattern of spaces and development, and that our environment may be the better for it."
We need to confront the need for density. I've denied and deluded myself that density was not the main issue. I've used words like 'compact', 'vibrant', and 'urban'. What is meant is more people per unit area, as well as mixed use and class.
Higher density is better for a city. Again, Holly Whyte: