The ORM of aircraft design minimizes the threat of that occurring long before the first aircraft ever takes to the sky. When was the last time an aircraft development project was canceled for other than political or fiscal reasons?

FWIW, the new stealth aircraft WILL be detectable by some new technology at some point - that is how this game works. You keep making incremental advances in capability that stay ahead of their incremental advances in their capability. KNOWING that they will make those advances, the long-term stop gap measures that you advocate are doomed to guaranteed failure much sooner than the full development program of the F-22 or F-35.