The Raptor’s avionics were dated even before the jet was declared operational in December 2005. While the Raptor is the most advanced operational warplane in the Air Force’s inventory, its computer architecture dates back to the early 1990s. The core processors run at 25MHz–since it took so long to get the jet from the design phase to production.
Moreover, the Raptor’s software is particularly obtuse and difficult to upgrade–which is partly why integrating the AIM-9X and AIM-120D missiles onto the aircraft has been so problematic. The jet’s avionics would have to be completely revamped for a production restart, not just because they’re obsolete, but also because the jet’s antique processors and other components haven’t been made in decades. That would be a very expensive proposition at a time when the Air Force’s budgets are shrinking.