I think that there may be a parallel between the Pentagon's pursuit of an all-stealth force, 1985-2015, and the SST history.
"The pentagon's pursuit of an all stealth force?" Where do you guys come up with this stuff? "All stealth" MIGHT be true for USAF, but even they said they intend to keep the non-stealth F-15 flying for another two or three decades. And USN has yet to get a single stealth aircraft and even after they do, they'll have many more non-stealth aircraft than stealth aircraft for the foreseeable future.