I see two endeavors that may be completely discrete: 1. Building from-scratch cities that are optimized for quality of life. 2. Evolving current cities into m

I see two endeavors that may be completely discrete: 1. Building from-scratch cities that are optimized for quality of life. 2. Evolving current cities into more nearly optimal. Which direction will this effort go? Is there a risk of from- scratch cities being built so fast that and being so desirable that they cause historic cities to empty out? And... what if the optimal solution is not cities at all, but, say, small towns?