Given the price of concorde tickets, supersonic travel is still the perogative of the rich (or business traveller with v good travel policy).
Concorde failed for 2 reasons
- fuel costs; remember the oil price hikes of the early 70's
- Noise; or at least that was the initial reason it was not given for not allowing landing rights in USA (-although I prefer to beleive there was an element of "Not invented Here" syndrome

). When Flying, cincorde flys directly over my house approx 10 minutes after take off and yes, it is very loud
I do not see any technical advances that significantly reduce noise levels of a supersonic craft, and fuel costs are still volatile. Therefore I think that Boeing are taking a BIG RISK here & that airbus will win out unles the running costs are low enough for the airlines to be able to offer a sensibly priced economy seat.
------------------
Chris Elvin