I think for travel around Earth, supersonic passenger aircraft are more feasible than rockets. Even if we consider sonic booms, a lot of routes where rockets would be desirable are across uninhabited oceans.
Sonic boom can't be the limiting factor forever.
They didn't even demonstrate performance on par with their 1950s era T-38 chase plane, and now they've retired their 'demonstrator' and pivoted into data centre power turbines.