After a few weeks of talking about saving Concorde when BA announced the a/c's retirement, Branson went quiet....why?......because his people did the research and found out the costs!
The aircraft are Museum exhibits now and modified suitably to allow visitor access, If you had one flying that would deprive the public getting on board.
The aircraft are being preserved for the long term, not to showboat sloowwwlllyyy around airshows for 5-10 years.