GM appears to be counting on VW to pay for the CCS charging network with their Dieselgate fines:
Charging Coalition Asks Feds for Fair Treatment As $2 Billion VW Settlement Unfolds - HybridCars.com
Audi (VW group) is already working on a plan for 175 charging sites over the next two years along interstate corridors similar to Tesla's Supercharger network. The federal government is also getting state and local agreement on a national map of preferred charging corridors over the next year. In the meantime, there are already DC charging locations up and down the east and west coast.
Clearly Tesla is way ahead, but remember that the Model S went on sale with hardly any DC charging locations. Between VW and other private interests and government agency efforts it is possible for CCS to fill in reasonably fast in the couple of years also.