There's one variable no one has mentioned: Where will the Electrical Parade go when WDW is done with it and ready to bring back Spectromagic? The parade route is a mess right now, but that changes next year. The park will be able to host parades again at that point. If the parade returns to DCA, the CMs will now have to manage a nighttime parade along with World of Color. The night dance parties are very popular and bring in food and merchandise sales, so that has to be taken into account.
It will be interesting to see how Disney further develops DCA beyond Carsland as the park is clearly gaining popularity amidst the construction walls.