With the exception of h-bomb/fusion and ENIAC/AI, I think all of those examples reflect a change in priority and investment more than anything. There was a trajectory of high investment / rapid progress, then market and social and political drivers changed and space travel / supersonic flight just became less important.

That's the conceit for the tv show For All Mankind - what if the space race didn't end? But I don't buy it, IMO the space race ended for material reasons rather than political. Space is just too hard and there is not much of value "out there". But regardless, it's a futile excuse, markets and politics should be part of any serious prognostication.