Jared Isaacman and SpaceX already made a proposal to NASA to do a Hubble servicing mission. NASA recently responded with "no thanks". NASA feels the risk of p

Jared Isaacman and SpaceX already made a proposal to NASA to do a Hubble servicing mission. NASA recently responded with "no thanks". NASA feels the risk of potentially damaging Hubble in some way (eg, gas from thruster getting on a mirror) outweighs the benefits. Basically a high probability of worse performance is chosen to be more favorable than a lower probability of better performance.