Back in the spring and early summer Lexington had a running dialogue about how the redevelopment of a downtown block would ruin the "entertainment district" that the "creative class" had begun. How the vitality of the block would be lost and the area would become boring like the rest of downtown.
I received this from DC Metrocentric by way of Greater Greater Washington. It points out how the clubs (music venues) do have a vitality at night, but can leave the area very dead in the daytime. Maybe that is why they are relegated to industrial zones in the DC area.
Downtown vitality should not be measured by just one group or one location, but for the whole area on a 24 hour clock.