Nobody will own cars in 20 years time and we will all be ferried around in driverless electric pods so I wouldn't worry too much.
If that ever happens (and I'm pretty certain it won't), the congestion would be horrendous.
Why ? Are you still thinking of one-car-per-person ?
One of the goals mesh and electric cars will be able to deliver is that no one needs own a car. I'm sure we'll look back on 1960-2020 in amazement as we realise that people actually spent tens of thousands of pounds on a machine that got used maybe 3 hours a day, and spent 21 hours doing fuck all on somebody elses land.
(Well, when you put it like that ....)
I think the "pod" idea is more about a fleet of little cars that are immediately there when needed, and which ferry you where you want to go, to then pick up the next user. If anyone owns them it will be the local authority, or a subcontracted company like Uber.
Going back in time, very few people were able to own private transport, beyond a stout pair of boots (and even then ...). Going forwards, I suspect that will be the way (see also owning property
)
Also, more people own a car in order to work, than as a means of watching sunsets all over the county. It's become a tool of capitalism, not a portal to freedom.
Returning to the OPs point, maybe congestion charging is the way forward. Coupled with the appropriate reduction (or elimination) of road tax and fuel duty. After all, we've PAID FOR THE FUCKING ROADS, and the PAID FOR THE FUCKING FUEL TO DRIVE ON THE ROADS, so maybe a bit of balance ?
Or just slap higher taxes on the fuel duty so those that burn more, pay more. Regardless of where they burn it.