Um, often, a sketch or a map is more effective than a long long speech.
This is the Greater Paris Metropolis as it is planned within the whole Paris region.
https://fr.wikipedia.org/wiki/M%C3%A...du_Grand_Paris
Except for southern Val-de-Marne and northern Seine-Saint-Denis, it is entirely densely urbanized and widely mass-transit oriented. There's no sprawling suburb in there, or only little. So yes, it makes sense to merge this whole thing of 7+ million people.
Sprawl is occurring in grey areas. That's where people really need cars and transit policies can't really be the same.