Isn't that the point, though? Who are these jets going to fight -- pretty much any realistic hypothesis of conflict today would consist of asymmetrical warfare, especially if waged by the US or US allies. Asymmetrical warfare with existing weaponry, let alone next-generation planes. The only scenario where the US would face significant resistance is vs China or Russia, where planes wouldn't even get the chance to take off before Midnight is upon us.

Given the situation, it would make more sense to invest in something cheaper that will do the job just as well.