How about a Spacex Starship recover and return hubble for upgrades?
For example in case of failure next gyroscope can we send small / cheap satellite with gyroscopes and attach itself to Hubble via Soft Capture Mechanism (SCM) ?
Soft capture mechanism may not be strong/rigid enough to translate the precision of movement Hubble needs for pointing.
Since it just needs new gyros why not send up one of the commercial crew vehicles with a Strela crane to perform the servicing?
Many of those options really start to get into the realm of economics. No commercial crew option has the standalone capacity for crew plus parts plus robotics. So it would be a minimum of two launches just to extend certain mechanical parts. With further launches if there's a desire to get the electronics and instruments back to peak condition. Then something has to boost its orbit.
If they do make Orion launch on a commercial LV it might be an option for servicing Hubble since it can support spacewalks though without an airlock module similar to Pris brought along it would be like the Apollo Skylab repair missions.
I wonder if the airlock module could be left attached to the docking ring?
Orion plus the parts should fit on a single Delta IV Heavy or Falcon heavy the capsule should be refurbishable after an LEO flight as EFT-1 is being reused.
Remove some of the propellants tanks to make room for storage like on the Skylab Apollo missions since even half the delta V would be overkill might even be able to omit the OME for the mission.
If launched on FH only an ESM and FH upper stage along with several smaller parts would be expended which should be fairly low cost mission probably less than a what typical shuttle servicing mission costs.
Not now.
Recover and deorbit and reorbit by Starship has many problems, not many of which scream cheap to solve.
If, and only if Starship actually works well, and is crew-rated, and suitable suits are available at the time it fails (or a mission is decide) might it approach 'cheap'. (lots cheaper than the last servicing mission anyway)
That is - NASA bears no cost whatsoever for their development, just a crewed flight.
Hubble may last this long.
(If you think this means three or twelve years.)