You describe Paris as if it's a shopping/entertainment center for the suburbs. It also looks like you're implying that Paris needs the economic activity generated by the suburbs. For that I would investigate what a suburb is by definition.
In the 70s-90s, it was! A lot of shops and movie theatres have closed in some areas like Champs-Elysées, Montparnasse, Saint-Germain, ... where people used to come by car from suburbs on the week-ends because they could, because it was practical, because they could park.
Places for shopping and entertainment have been created in the suburbs since then, which is a win for the suburbs but not for Paris which has become depressing.
