Subsonic flight has become much more efficient, cheaper and when paying for higher class, more comfortable. This is one of the reasons often mentioned for the economic demise of the concorde. The audience willing to pay $6000 on a concorde ticket, could now spend $4000 on first class subsonic with a seat that fully reclines into a bed. They can fly a little longer at night but sleep the whole journey.
Wendover did a good economic analysis of the concorde: https://youtu.be/n1QEj09Pe6k
