Harry:
This thread on "F-35 Cancelled, then what?" started about four and a half years ago. `
It still isn't cancelled.
Perspective:
in about the same amount of time, the UK went from outrage that Poland had been invaded, through the Blitz, Victory at El Alemain, and were working their up the boot of Italy (and on the other side of the world, back on the offensive against the Japanese in the CBI theatre) .
Numerous versions of Spits, Hurricaines, and other aircraft had been produced since then. P-51 was becoming the better version of itself as well.
Aircraft acquisition and certification, as well as IOC, has sure come a cropper in the modern age.