It would be a waste if technology suceeds us that way.
As I've said, once the NGT is operational and should Hubble still be, instead of shutting it down to be picked up by shuttle (and hopefully saved that way), it should continue to be used by the world's astronomers and students.
Hubble's observation schedule must be packed and I've been wondering how they are handling that now. There should be a smooth transition from the federal level to the public level in Hubble's case. Also, as Phil mentioned, the NGT may not meet the 2009 deadline. Hubble could also be good insurance.
Marcia