We already do something like that: we allow around 1 million cars on the island (with around 6 million people living here). We auction off the rights to operate one of these 1 million cars for ten years at a time (you still need to buy your own car, of course).

Your proposal would be equivalent to dropping that number from 1 million to 0 million.

I think a reduction in the total number of cars is worth debating, but I don't think 0 is the optimal number.

Though I do wish Singapore would take inspiration from Japan, and eliminate street parking; and in general have the government exit the car storage business.

Isn't it better to allow a few luxury cars that are taxed to oblivion? As long as there aren't too many cars, the city can be pleasant, and it's a nice source of revenue.