I've lived in Oslo for a while and I only used my car then to travel to my home in Sweden on the weekends. Using the car in town was out of question. I hate driving in cities. While in Oslo, I got by using my feet and public transport. Also grew up in a smaller city. I see no problem banning cars in cities; provided that public transport is good, e-bikes are available for rental and there are good parking lots on the outskirts of town for visitors - of course with public transport into town centre from these parkings lots.
I now live 20 km from the nearest town and basically need a car due to non-existent public transport (10 km to nearest bus stop). I am putting up a solar charing station for my upcoming electric car though, and intend to get an e-bike to use when the weather allows for it. So I'm hoping to be 100 % off-grid transporting very soon. Here in Sweden on-grid electricity is taxed 50 % or higher, so I also see this as an investment keeping money from the government - which fails to deliver the services it should.