My thoughts, unless GM get's back into the market coach builders are not going to step outside their comfort zone for any new chassis builder that doesn't have coast to coast service for the buyer. The chassis might be provided by someone else but the house builder is who's name is on the final product.
Maybe when someone comes out with a hybrid or electric powered chassis with a load capacity of 18-26K Lbs, good range and recharge time along with a comparable pricing with the current gasoline chassis the market might change. Until then we're looking at Ford as the only option for a while longer.