Before the STS-107 tragedy, NASA's plans called for two more servicing missions to extend the HST's useful life out to the year 2020. After its distinguished career in space was finished, the historic instrument would be loaded into the payload bay of an Orbiter and brought back to Earth for eventual exhibition in the Smithsonian. No longer, in the wake of STS-107. The debate over the HST's fate is becoming quite spirited. Read about here: Whither the Hubble?