The average production rate of the F-4 in St. Louis was about 200 aircraft per year from 1958 to 1979. The peak was an airplane every day.
There are more F-4's in this 1 million square foot building than the entire current annual production of F-35 of just over 150 airplanes.
Expansion of production is possible by dispersing to new locations, and likely difficult to support with basic materials and even fasteners. Assemblers, too.
Darkening the skies with modern F-15's is not the worst idea. A suite of updated aircraft (F-16's, F-15's, even nasty F-18E/F/G's) that can truly share information would be tough to crack. An all out war will start with a barrage of cruise missiles carrying explosives and I hope high energy weapons that effectively disables every critical electronic device.