How will the total stock of vehicles decreasing result in cheaper Ubers? It seems like that would lower supply (fewer cars to provide transport) and increased d

How will the total stock of vehicles decreasing result in cheaper Ubers? It seems like that would lower supply (fewer cars to provide transport) and increased demand (fewer people with their own cars => more people turning to Uber). The article agrees that a more efficient use of resources won't cause (net) harm. It claims it might harm transportation and benefit everything else, for a net benefit.