Stigma. It looked too much like a Station Wagon.
When I was a kid, the neighbors had a Caprice Classic Station Wagon with the third row backward facing seat. As a kid, I guess I loved the novelty of looking at the people behind us for some reason. My dad was buying a new car and I told him he should get one of those to which he replied "I'd never buy a station wagon."
To him, the station wagon was the "Soccer Mom" car; a car that -- driving it -- would have made him feel old, I guess[0]. I was surprised to hear the same sentiment about Minivans as I got older. Everyone saw them as a symbol of being tied in suburbia with a litter of kids. So they buy SUVs/crossovers, some of which are classified, ironically, as a Station Wagon.
Incidentally, I've owned a Grand Caravan. It was my favorite non-convertible car. It was like driving my living room, except that my couch doesn't have air conditioned or heated seats.
[0] I have all of zero enthusiasm about the car I drive. My first car was a convertible. Ever since ditching the convertible, I don't really care what I'm behind the wheel of.