Exactly - its minivan to SUV swaps mostly. And its the same vehicle under the hood. Increased safety standards, crumple zones and side curtain air bags add some girth..

Station wagons I think also partially fell out of fashion because you can't do a 3 row wagon safely anymore as there's no way the rear facing vomit seats are going to survive modern safety tests.

Also don't forget how ginormous modern kids seats are in cars, and how many more years kids are legally supposed to sit in safety seats compared to when we grew up. Few sedans are comfortably able to take 2 of these kid seats and still leave you with room for much cargo or a 3rd adult (grandma or grandpa) at the same time.

The market for 7 seaters (of which 4-5 may be occupied at any one time) is fairly large.