I think that there much better approaches to your problem than to just wack a great big car park on the outskirts.
For instance if you don’t have a car, the money save from not having a large piece of machinery sitting around most of the time would probably more than make up for a few train tickets. Another option is car share fleets which allow you to split costs and avoid a cost of owning a car.
Even with electric cars, cities should still be designed for people rather than cars. Electric cars are still a massive burden on the environment so we shouldn’t be aiming for most people to have their own.