Yes, car ownership has not gone down, partly because of population growth,
but the use of cars has gone down.

Twenty or so years ago, suburban streets away from railway stations were
mostly free of parked cars during the day but had bumper-to-bumper parking
at night. Today that night and day difference is far smaller because people
are leaving their cars at home and are travelling by public transport. In fact,
isn't this one of TfL's proudest boasts?