For the Rafale, a plane that has both a navalized and land-based versions from the start, the navy version is reinforced and that leads to more weight (about 1 tonne, IIRC). This for a somewhat small fighter jet. Imagine for a bigger, commercial airplane. And, the heavier the plane, the bigger is the proportion of it's weight has to be reinforcement. I bet companies would stick to a higher payload instead of a reinforced, more fuel demanding airplane.
Nevertheless, amazing achievement for the Navy. Maybe it has some hobbyists/scientific uses for civilians, but I believe that's it.