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That’s kinda hard to do become of how perfect RDR and RDR2 are. It’s kinda like making another Batman game separate from the Arkham series.
Do you really trust Rockstar with remakes after GTA? >

honestly, not really, but it would be nice if they were to make a RDR1 remake and not fuck it up >

For the sake of the main story, I agree.  There's nothing more that needs to be explored with the Van Der Linde Gang or Arthur or Dutch or John or Jack.  
Some people have thrown around the idea of a spin off with Charles and/or Sadie perhaps taking place after the prologue in RDR2.   I just don't think a game about Charles moving to Canada to find a wife or Sadie moving to Brazil to become a bounty hunter for plantation owners would be as wildly interesting or sell as many units as the main story.  At least in the eyes of Rockstar.
Somebody will likely make a mod that has these potential side stories. >

I'd be good for another wild west game separate from the RDR games.