I cannot express just how much I want this to happen.
No attempt = hubble will fail and reenter
Attempt(failure) = same
Attempt(success) = hubble continues groundbreaking science and, after some time, can be brought back to earth via Starship to become a museum piece that inspires generations!!
The concept I saw involved putting the reboost module in Dragon’s trunk, docking with that, and EVAing over to plug in a handful of connections. That seems doable.