Because the production facility in Everett is currently building 767's (in the largest building in the world by volume), the workforce and supply chain are in place, of course, and the process has been highly refined in the 30 years since the prototype airframe began construction.
Sure, it's possible, but it certainly would not be profitable.
It was a tongue-in-cheek question.
Everyone knows it’s a poltical——not a business-—decision.