Our city has reached a tipping point. Just look outside, in the streets, where rentable, shareable Indego bikes have come, conquered and multiplied. Meantime, regional rail ridership is at an all-time high, and SEPTA usage in general has been trending up. Philadelphians are driving less, and all over, parklets are winning out over parking. But the most visible shift happened last September, during the Pope’s visit, when thousands of people took to the car-free streets to revel and cavort and see the city in an entirely new light.