Boondoggle ahoy

I was worried when the consensus plan for maintaining air superiority relied on not just scrapping the F-22, but instead buying more of the cheaper F-35 instead. Our F-15s and F-16s are still the best out there, and I want to balance our overall budget. Now, it seems that the F-35 is about to get way more expensive. (For the record, the math here is weird; it says that it's going to get 50% more expensive, but the actual figures given are 90% more expensive.)

When do we just say "screw it" and go back to the beginning?