There is nothing about Clark that tells me he has to remain White in order to retain the core traits of the character that most matter. If they end up using Clark I would prefer he’d be a white male but if a black actor comes along who captures the inherent qualities of the character then I’m mostly fine with it.
Either way, as I stated before I’ll reserve judgement for the project until a director is announced. Whether I get excited for the project or not depends on the caliber of filmmaker they hire.