Cost was what brought supersonic down. Comparatively speaking, it may be the cost/benefit curve that will decide the limit of this generation of technology. It seems to me the stuff we are looking at now is massively subsidised by exuberant private investment. The way these things go, there will come a point where investors want to see a return, and that will be a decider on wether the wheels keep spinning in the data centre.
That said, supersonic flight is yet very much a thing in military circles …
That said, supersonic flight is yet very much a thing in military circles …