Do you want public or private service? Either way if you want this leaf service you must be willing to pay for it.
Let's see -- how many employees and how many trucks and how many vacuums and how much fuel would it take to pick up leaves at least twice per year for the 1 million plus residents living in the 300,000+ single family and townhome dwelling units? Plus we need a smart way to dispose of the leaves instead of just filling up landfill space (maybe - compost and/or provide 'free' mulch back to citizens).
Should your local government do that? Or should you arrange that through your privately contracted solid waste and recycling service? Communities that want the County to do this can petition to have a "sanitary district" tax added to your real estate bill and the County will haul your trash, recycling, and yard debris.
Here is what the County provides for sanitary districts in exchange for $345/year per home:
http://www.fairfaxcounty.gov/dpwes/trash/guidelines-text.htm
How to petition if you want the County to provide this service:
http://www.fairfaxcounty.gov/dpwes/trash/coll_initiation.htm
Map of current areas which like having the County provide these services:
http://www.fairfaxcounty.gov/maps/images/maps/handouts/pdf07/sanitarydistricts.pdf
Many neighbrohoods use the County services and like it. Most County residents are still using private contractors for these services.