I think you missed the point of what Marchionne is saying - the fact that they must shuffle production from plant to plant to prevent having any downtime on either the Wrangler or Ram. They're moving the Cherokee line out to free up a production line which will in turn allow them to retool while continuing to produce.
That is, the Wrangler production is in fact moving, it's just going to the other Toledo line after they've moved the Cherokee and retooled. So essentially it's the opposite of what you're saying - they're taking the time to set up new production lines for the Wrangler, the new Ram and potentially the long wheelbase Wrangler (pickup).