Not much would appeal to me either besides the legendary animals, and exclusive horses it has. Maybe they could just rework the roles into more sidequests, or something? I don't know, but I do know that RDO has been a disaster since nearly day one, and should've been scrapped all together a long time ago.I can honestly say that none of the content in Red Dead Online would appeal to me in the single player.
At least with GTA Online I'd enjoy the heists in single player a lot more. But as far as I can tell RDO has been nothing but bullshit businesses for people to harass you as you try to earn a buck.