IMO, the U.S. government has always been somewhat conservative when choosing new aircraft. They seem to stick with conventional-looking (evolutionary) types that perform relatively well (outperform previous generation models), versus "futuristic" (revolutionary) types like this one. I know there have been some exceptions (SR-71, F-117, etc) -- but look at a recent example -- YF-22 versus YF-23. From my understanding, the YF-23 actually outperformed the YF-22 in several categories, however, the gov felt somewhat unconfortable with its design.
Am I wrong?