A friend of mine from back home is polling interest for a velodrome in New York City. Someone floats the idea every few years, but it is always tough to generate interest. Show your support by joining the "NYC Velodrome" Facebook group (dreaded Facebook...), and telling everyone you know.
I think it makes sense to make the infrastructure investment for a world-class velodrome in a major population center. I'd love to see the day where there is a permanent indoor velodrome on prime real estate in New York, readily accessible by public transit. With the number of internationals living in the city, and the spectator friendliness of track, I'm amazed this has not yet happened.