The lack of a space shuttle also severely compromises the future of the space station. The space shuttle remains the only way to get heavy and large payloads to the station and return large and heavy payloads back to Earth. The Russian Soyuz can ferry our astronauts to the station, but it lacks the capacity to transport large payloads to the station and from the station to Earth.
http://blog.chron.com/bakerblog/2010/04/former-jsc-director-george-abbey-on-obamas-nasa-speech/
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