>>281642414
They kind of did with Megalo Box and its second season, Nomad.
It's the 50th Anniversary anime project for Ashita no Joe.

It's not a literal remake (it's its own universe) but it's sort of a soft-retelling of Ashita no Joe in a near sci-fi future with a few twists. First season's kind of alright but the sequel, Nomad, is phenomenal.