Earlier quoted context omitted.
What's wrong with a vast majority of the vehicles on the road not being owned by the people who use them for transportation? It seems that a large amount of people don't want to purchase and maintain a vehicle they might not always be using and instead pay on-demand like they do for many other services where someone specializes to reduce the cost for others?
Nothing's wrong with that; in fact, that seems like the ideal scenario. I think there should be a financial disincentive to owning a car in the city, especially if most of the congestion is due to private car ownership. If Uber+Taxi make up a small percentage of traffic, then limiting them to fix congestion seems like a stupid idea.
Expensive parking on top of all the other costs is enough for most people who aren't pretty well off.