Seiously, though, the SSC effectively does have a full FBW system - Mech. mode is not there for cost reasons but because there was no way the regulatory bodies of the '60s or '70s would dream of allowing FBW without back-up.
To my knowledge, mechanical mode hasn't been used in anger in all the type's years of commmercial flight.
There are many ways in which the A320 series can be seen to be the son of Concorde - eg the sidestick already mentioned (fitted to 02, I believe), the use of limit selection switches (to,flt,crs ratings) while leaving throttles fully open must presage the detents on the 320, inertial input to autothrottle etc.
I do have to disagree with the assertion that the Conc would necessarily have been improved by the use of sidesticks - it already has the most outstanding handling qualities; a tribute to the French half of the design team who were responsible for flt control systems.