That's the wonderful thing about technology, it can be upgraded. Did you know that the B-52 bombers that are still in the inventory started life much different than they are today? Amazingly enough the airframes are the same as when they were built in the 1950's and '60's, but the avionics (the electronic bits) are vastly different than what the aircraft was built with.
The same go's for the Shuttles. The airframes were still in good order, all that needed to be done was upgrade the electronics suite.
How much payload could they carry? How many flights to the moon to build a base camp for further space exploration?
I don't claim to be a rocket scientist, but what I saw yesterday was impressive and how I see the future. You're not stupid WW, but you seem to see the world by your ideology, thus a mind close to new things, new ideas and change.