Residential coal burning in the Midwest would come back if there was a product to burn it. Right now it is like selling snow to the Eskimos. You could give the coal away for free and still have no takers because aside from those hand fed add-on furnaces, there's nothing out there. And, I've burned Indiana coal in one of those furnaces 30 years ago and it was a colossal mess. NOBODY is going to put up with that unless the price of oil, elec., LP, or nat. gas goes up so high as to make it worth suffering through.
It is going to require something like the Combustioneer or Stokermatic stoves, and SMALL stoker boilers be available. The Combustioneer was made in free standing as well as add-on furnace models (with plenum/squirrel-cage blower) and would be a good size for modern homes. The Coal-Man and P&M stokers are HUGE and WAY oversized for any normal home.
Some of the Polish stoker boilers
This link is broken, either the page no longer exists or there is some other issue like a typo.
look very suitable, but I don't know how well they will work with Midwest coal - no refractory hearth and no rotating ring. I'm not sure a rotating ring stoker will even work with our coals.
But until energy prices go up enough out here and there is a product available to burn our coal relatively cleanly, it's indeed a dead subject. I can assure you that very very few people are going to dig up old stokers and custom build heating plants like me. I'm just a weirdo!