Agreed, a shame that one of DC’s most visible black characters never got a shot at a solo project of some kind. I don’t think it’d be terrible to bring in a new actor to carry on what Fisher started and unfortunately squandered.
Joivan’s Cyborg is really good, but he is at the end of the day part of an ensemble. Not to take away from his performance or the way he’s been written, but that diminishes the gravity of his character and the potential Cyborg had in the mainline DCEU as a full lead.
Though I think you’re right, the Cyborg push seems to have come to an end and it’s unlikely we get another movie iteration unless they bring in the Titans. I don’t think most fans would be up in arms if they were to recast Fisher, but between race-swapping white characters, smaller non-white heroes like Jaime getting pushed, and corporations’ irrational fear of Twitter backlash it doesn’t seem in the cards.