I just want to be able to play through the actual storyline with an RDR Online character. Arthur is fine, and I wouldn't mind at all if even the female models used his voice and animations, but there's a level of detail and playability in the single player sandbox that just isn't there online. +1 amazingness if you can shop the online clothes options in the single player store.
Really, if you could layer the online stores and character creation onto the single player experience that would be worth a fortune. Now that I've said it out loud, it seems pretty difficult.