You're forgetting that Isuzu had a bad name for the Trooper rollovers. I think this was a major part of the Isuzu failure in America.
While the Isuzu's enjoyed moderate success in the 4x4 infancy, the Jeep/FORD market was able to capitalize.
You may point out (and rightly so) that the Ford's also had issue's with hwy rollovers. But, they were successful in pointing the finger at Bridgestone. So, they recovered.
Trooper had no scapegoat. The brand was damaged. Whether the lack of advertising or something else, I don't think they did enough to save the brand.
It could be that reliablity and/or fuel enonomy issues didn't help either. People tend to buy America unless their preferred vehicle class has a better foreign model in terms of reliability/economy ratings.
In my jaded view of things, I also think corporate giants would never pass up on the opportunity to continue making money on a product. OTOH, I don't know much about the mold method desribed here. At least not in terms of production costs and how profitable/costly the VX might have been. So, the issue of continued production might not be so clear.
I'd like to think of the VX as an under-advertised icon of the Isuzu era....as a vehicle worth more than the sum of it's parts. In the Chevrolet community, I'm sure they could manufacture and sell Corvettes for much less than they do. But, their goal is to create an icon...a legend...to boost the brand name of Chevrolet. In doing so, they can make money for the brand without every car sold actually BEING a Corvette. Obviously, people have different needs for a vehicle.
In the case of a small 2-door "performance" 4x4, I'm not sure Isuzu was positioned as the brand people wanted to be associated with...especially being a foreign brand associated with the 4x4 rollover era. But, that doesn't mean the Vehicross couldn't have been something much bigger -- if the right advertising campaign had been in place.
I know the Isuzu brand name never was sold on me. I didn't by a VX because it was an Isuzu...I did so despite that. It's the first foreign vehicle I've owned since I was very young. Granted, it's made from some heavy Chevy heritage....but I never would have know that w/o coming to this forum.
2001 Ebony VX and 1989 Custom 383 Corvette