I suspect that Ruger's legal staff won't allow them to reintroduce it unless they come up with a transfer bar safety system for cap and ball revolvers.
Ruger ain't a cottage industry anymore and that means lawyers go after them. There's a reason that most traditional style muzzleloaders today are the product of a cottage industry. Corporations that are worth suing won't touch them with a ten foot pole. There's just too many ways idiots can hurt themselves with them.