As long as the new F-150 proves to be a success.
The new Ford F-150 is clearly a game changer within its highly competitve segment, mainly due to its extensive use of lightweight aluminum. Compared to its predecessor, the new truck is some 700 lbs. lighter and that translates into some serious fuel savings. Up until now, Ford has been quite mum as to whether this aluminum body construction will trickle down to other models, specifically its SUVs and CUVs.
As long as sales and everything goes well with the new F-150, the next-generation Explorer and Expedition will very likely receive the same aluminum treatment. Ford is confident F-150 buyers will appreciate the reduced fuel costs, so it makes complete sense its SUV buyers will want the same. However, it'll be at least five to six years until the Explorer and Expedition make the switch. Ford wants the prices of aluminum to drop so that it doesn't have to dramatically increase the cost of either vehicle. What will also help Ford here is that base pricing is typically higher for SUVs, thus making it easier to sustain the higher cost of the aluminum itself.