Even if, as Bellerphon pointed out, costs and engineering effort were substantially reduced by limiting a preserved Concorde to M0.7, I have to say a lot of our guys are doubtful it could still happen.
But, rumour has it that Rod Eddington (who is really pushing this-no doubt he regrets and is angry about being forced to retire Concorde early), wants a fully functioning Concorde.
So another meeting with Airbus is due, they would have to be involved in any preservation effort, much more so if it was to stay supersonic.
On the other hand, a fully functioning Concorde could also be attractive to Quinteq (the new name for the Defence Research Agency), other European aeronautical agencies, Airbus and even NASA.
Look at all the effort Boeing had to go through to get a TU
It would be a shame to see Concorde's still unrivalled capability being lost, (I remember a few years ago some guys from the USAF
F-15 units based in the UK visiting us, when we told them how long we could sustain Mach 2 for their jaws dropped).
Maybe once the A380 is in service, a match for the 7E7 is in the works, the A320 updated, Airbus will look at an SST, they'll need a research vehicle.
But it is early days yet, it will be hard enough keeping a subsonic Concorde flyable.