More bike infrastructure, bike rentals (especially in the vienna/tunnel hill area), people organizing/attending group rides for newer riders/people not wanting to ride 20+ mph. My wife leads the C group from BS-carterville, and that group is regularly growing with new riders. She and Trish work to help get people comfortable in groups, riding pacelines, and in general gaining confidence on the bike.
Many of the people have never ridden 15 miles, then they go out with the group, get chatting, learn to draft and 15 is done before they know it. I hear it every week.
EDIT: Lastly, ladies in cycling. We have a lot of lady cyclists in the area (I see them all the time), and we need to find a way to draw them to these rides to grow the community.