I think that's only true in the enthusiast world. The Wrangler is a decent "car" for people who don't plan to use it off-road (still a cool looking convertible SUV). And despite it's solid axles, it's pretty modern and gets fairly luxurious. I don't think the 70-series would sell well here. Super dated safety standards, dated interior design and ammenities and dated exterior, and it'd be too expensive to compete with American work trucks.
It's great for what it is: a commercial vehicle for moving equipment/supplies over bad roads. But we have nice roads and cheap work trucks. So we don't value reliability over third world road conditions as much . Even the commercial users are starting to ditch the 70-series because it doesn't meet modern safety standards. It needs an update. Jeep seems to be considering making an HD Wagon version of the upcoming JL Wrangler. If they do, it'll probably compete directly for the industrial contracts keeping the 70-series alive. It seems like a lot of 70/200-series users internationally would rather have American full-size trucks but can't get them. We forget that in other places it's not normal for normal people to be able to buy 2500 and 3500 trucks. And it sounds like South Africans seem to wish Jeeps were more affordable there, because it's the fun exotic option there, much like LCs and LRs here. Everyone wants what they can't have.