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Its relative. Paris would be even denser given the extreme demand in the city, and with modern technology could be say the 10th densest city and still very livable.

I'm not sure what the point would be though. You could build all the residential skyscrapers you want in La Defense and still be within 15 minutes of most of Paris proper.

This is a non-sequitor. How dense it is relative to other cities is irrelevant with regard to whether it's dense enough to meet the demand for housing in the city.

According to Wikipedia[1], Paris is the 34th densest city in the world. 5 French cities are denser, and all of them are Paris' suburbs. Only 3 non-French European cities are denser than Paris.

Then let make Paris even more dense than Paris' suburbs.