Last night I dreamt that Pittsburgh was giving out incentive money (they’d gotten a grant, of course) to anyone in the metro area who would move closer to the city center. There was a bonus amount for crossing into the city limits, but that wasn't a requirement--the idea was just to dense up the whole area. If everyone could move a little closer in (closer to the city that is the reason for the metro area), it would make a noticeable difference in population.
I woke up thinking that there could be a separate incentive for moving close enough to your job to walk or ride your bike. Just think how great these movements would be: shops, grocery stores, and restaurants would thrive; streets would be safer in at least two ways: less desolate and fewer killer-cars; city services like libraries, schools, snow removal, public transit, and police coverage could expand through adequate tax funding; the long-discussed city-county merger might finally happen. The city would attract more tourists and transplants because we'd have a new light rail running through the center of town and we'd be voted Most Walkable City.
What else do you imagine could be the impact of more density in Pittsburgh and the immediate area?