Found a good article by The Drive that discusses GM's decision to transition the Blazer to another roadgoing crossover. They claim that interest in a body on frame truck, is extremely low and that kind of vehicle has never a part of their original plans.
Here's Why GM Didn't Make the New Chevrolet Blazer a Rugged Off-Road Truck - The Drive"For this vehicle, with the midsize, two-row customer really being design forward, we looked at the business case, and those customers aren't necessarily looking for the body-on-frame," Chevy spokesperson Maureen Bender said. "So we kind of have a modern interpretation of a Blazer with this being a crossover. It was never intended to be anything else."