I don't know about other US cities, but here in Seattle, public transportation is getting worst. The system is loosing too much money, and with city growth (lots of parking spaces going away replaced with bicycle lanes) - Public Transport (King County Metro) is cutting services, especially now that people need it the most. With all the cuts overcrowding will be a problem.
I haven't got on board a bus in about 4 years, and Light Rail since July - even driving is tough at times. In a way not relying on Public Transport too much anymore.