To my knowledge the Museum authorities have given up on the project of having Concorde SD
taxiing on her own engines power. I can understand why. They don't want any accident big or small. One is engough.
I think it is a good thing that they carried a boroscope on (was it only one of) the engines so they know the engines conditions are still intact the same as they were when Concorde SD
stoppef flying and was taken into the hangar where she is now resting.
There is a very dedicated team taking care of the two Concordes in the Concorde hall. I think only one of them, a former Air France aircraft mechanic, is being paid - the rest of them are all volunteers.
Visitors can get on board the two Concordes F-BTSD
and Concorde 1 prototype F-WTSS by buying a separate ticket at the Museum entrance desk.
The Concorde hall is sometimes rented to companies for dinners and receptions. Other halls might be as well. It is always accessible for free to all visitors of the Paris International Air Show.
We may one day see Concorde SD
outside again but I doubt we will see her taxiing on her own engine power... but nothing in life is ever 100% certain.
As for a return to flight I will say it's a definite No as it would involve humongous financing that the French government does not have at this point in time. The Air and Space Museum at Le Bourget is a part of the French Ministry of Defense and under their care.
Take a quick tour of the Paris Le Bourget Air and Space Museum by watching this video