Despite what reading enthusiast forums would lead you to believe, I just don't think that the market is there. Last year, crew cabs made up 83% of truck sales and single cabs made up 3%. 3! And the article suggests that includes fleet sales. In Canda, the proportion was even lower (88% to 1.5%).If you go back to Illuminance '84 Dodge the country was flooded with single cab small pickup trucks. The Japanese were making them for our big three as well as selling their own. So much so that the US. put a tariff on them. I think it was 25 percent. That killed the little single cab. The government not the buying public killed the single cab truck.
Think about your local contractor, painter, electrician etc. He needs to carry some personal tools and light supplies to the job site. That's who all the sales went to. The little guy who needed a little truck. Those guys are still around, writing on this very forum. Homeowners too, who could use a small truck for the families second vehicle. A commuter during the week and a Home Depot work truck on the weekend.
I think those potential sales are still there.
It's kind of like stick shifts. I love stick shifts. Everyone on the websites I read loves stick shifts. No one buys stick shifts on anything but sports cars and Wranglers (and even there, they are becoming less common).
I think part of the issue is that that market who wants regular cab trucks and stick shifts also wants them to be cheap. Or they buy used. And both squeeze the margins of the makers.