I think it's more of keeping the dealer lots full and not lose money. Usually takes 2-3 months to retool a factory. Once the JL is up to speed they will shut down the JK and start to retool that plant. A good example is what happened with the minivans, they only had one plant, so they tried to build up excess inventory before shutting it down, but still ran low on vehicles to sell. Cost them a good amount of money. Right now the Wrangler is the goose that lays the golden egg. So they don't want to run low.
Jim
Jim