WWW, you really have no idea of what you are talking about. Richard Branson was not firing from the hip when he suggested that Virgin could take over Concorde and run a profitable service; a very great deal of research went into this proposal, and it was most certainly achievable had the will of the UK Government and BA been so disposed.
The design authority, currently held by Airbus, could have been transferred to BAe. I understand that both they and another company were seriously interested in the proposal and had a great deal of constructive input into the negotiations. As for line engineering, while Virgin does have hangarage, it's probably inadequate for the intensive pre- and post-flight attention Concorde needs. Therefore, I believe, it was on the cards that BA Engineering (who have some expertise in this) would have been sub-contracted to continue doing what they already do so well, albeit in a scaled-down operation.
You may not like Branson, and you're entitled to your opinion, but don't make the mistake of assuming him to be the bumbling incompetent he sometimes appears on TV. The Virgin proposal was serious and credible, and born of Branson's enthusiasm for the aeroplane and everything it stood for.