Amos,
I have used the same arguments whenever a return-to-flight for Concorde was mentioned.
Then I looked at the BBMF site, and saw the number of "sorties" they flew per year, and was amazed.
I agree they have some very hard work ahead.
I also agree the airshows will not pay for it all alone.
But if they can turn XH558 into a high-visibilty icon, sponsorship and other sources of funding will also become available.
What about the Connie? She flies... !!