I wasn't saying abatement would reduce the value, I was saying that it would make them easier to sell. I know there are outfits that will carefully remove the outer jacket and abate the furnace or boiler without any damage to the components onsite.
I would still try listing them first. If you don't get any takers before the house needs to come down, you could always move them to a storage area until you can sell them. If they're moved in one piece, you shouldn't have to worry about asbestos exposure.