
A commenter on another site had a fantastic idea, in my opinion: before sending the last of the orbiters to a musuem, use the SCA to take it on a tour of the US. This would be a great opportunity for millions to see it and the modified 747 together.
Wow, that brings back memories. The Enterprise went on a tour like that back in the early 80s. I saw it at Dulles airport, where they parked it out back of the terminal still mounted on the SAC. The crowd was so big they closed one of the runways and turned it into a parking lot. (My VW bus broke down in the heat and I had to call a tow truck out to the runway!) The Concorde took off on its flight to London, and got special permission to flyby overhead. When the pilot waggled his wings in honor of the shuttle, it was the loudest thing I'd ever heard.
Doubt you'd get that much of a crowd these days, and of course the Concorde is gone, but it would still be a trip to see it again.
If all else fails, immortality can always be assured by spectacular error. -- John Kenneth Galbraith