Imagine RDR2 but with the replayability of Skyrim. There is a reason why Skyrim is still such a popular game and why most of us have purchased it more than once (which is weird, right?): because it is the ultimate example of a replayable game.
The focus on RDO takes the game a little bit in this direction, but the multiplayer aspect takes away from the immersion, and the fact that you can't have character names like Old Bill and instead see people called xX_SUICIDE69_Xx running around really spoils it.
I want to go fishing, put my fish in a cart, take them to market, sell them, then go play some poker with a beer, before returning home to my small shack that I'm slowly decorating.
Is that so much to ask for?