I mean, many of them think Bush Jr was a swell guy now. Granted, it's been longer since he was in pop culture ("the discourse"), but from what I've seen, rebranding to be lib-friendly is eventually possible for literally any conservative, so long as that conservative is framed as being oppositional to the current agreed-upon villain.
I agree that Cheney was always in a better position for it, but I don't think that rules out worse offenders of liberal sensibilities from getting the rehabilitation treatment. You could be right, but I'm curious why you think MGT in particular could never be rehabilitated in the eyes of libs - libs who are always hungry for an excuse to extend an olive branch to fascists who make the right noises.