i think it all boils down to----is there a market for this, or any other type of vehicle? If no, they aren't going to do it.
1) Would anyone who is hard core with previous blazers buy a new blazer if it was available? Even someone like myself who is short on time and would be open to buying new, would not automatically 100% definitely do it----because of the cost.
2) The majority wants crossovers now, so that's what is offered.
3) GM is and has been RE-active rather than PROactive and conservative; They are going to wait for ford, chryco, or the imports to try something first, THEN if it's successful will they come up with something similar. This has been going on for at least 60 years.......
(the only exception i can think of is duallys and crewcabs, but even that was a result of a reaction to the mustang.)
(The blazer itself, while an original concept, was also originally a reaction to the bronco etc)