I agree that this area has a lot of potential. It already has a lot of things going for it that other places wish they could have. They have a suitable site, a willing partner in the City, and heck there is even a base set of trails and features to work with! Most places take years to get to that point.
I agree with Jon: The best thing that can be done is to get involved. Join up and be a member. That gives you a voice. Lots of folks like to work on this sort of thing. CORP can help provide a base of support when needed,as well as a connection point. And it's not our first rodeo so there are resources to draw on as well.
I would consider tweaks to make it an all-around Bike Park. That makes it attractive to more people. Getting it maintained regularly makes it attractive to others. And prolly not the demographic you are think of, but making it attractive to kids and families will do wonders for you. Everyone from City Hall on down will to support things that little kids enjoy. And there are ways to do it that make it so the little ones can have fun, and still be fun for the bigger kids in us as well.