Since a new design will look like shuttle, and a tremendous amount of cost can be avoided by using what we have, it seems obvious that this would be the proper approach.
A new design would entail recreating much of what we already have. Most Ameericans donot appreciate the tremendous amount effort expended in the design, test, & operation of the various systems/subsystems, and in the correction of problems that have occurred over the last 30 years.
The total design, of a new vehicle is unnecessary & extremely wasteful since we have a functioning, existing prototype (the shuttle) in the museum, a sucessful proven flight unit !
Several US astronauts, including the legendary Neil Armstrong, wrote to Nasa administrator Charles Bolden on 30 June warning of an "unacceptable flight risk" because the Soyuz lacks the airlocks, life support systems and robotic arm that allow the shuttle to act as a base for spacewalks to repair the ISS in the event that a systems failure or accident on board the station makes it uninhabitable.
Christopher Kraft, the former head of Nasa's Manned Spaceflight Centre, one of the authors of the letter, warned of a "catastrophic re-entry" of the 400-tonne station into the Earth's atmosphere and showers of debris if there was no capability to fix it in the event of a "terrible failure".
Reminds one of the 3 Satern-5 rockets of Apollo,now wasted, with only small operational costs to have used them then, provideding us with 3 missions of additiional Lunar substantial knowledge and insight.
Future references of man, are based on his passed references, with Shuttle/ISS "spin-off" technologies flowing into the U. S. economy totally overlooked within our future consideration of this critical issue. No dollars for space ever left the planet.
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