Reusable rocket is a pretty huge game-changer. It is something that was quite already possible in earlier decades, but there was no appetite to do that because of economics (from '80s to 2010, Soviet Union fell and American Space sector was gutted into cost-plus pork barrel grant of jobs to various states).
SpaceX is the first success of NewSpace, and the revolutionary cost-saving of Falcon 9 seems to continue with Starship, which is 100% reusable, unlike F9.