I would like this, I don't think having spent countless hours in RDR would take away from my enjoyment of this as it would be quite different. Not familiar with how Texas looks nowadays but I'm assuming Dallas is distinctive enough to be visually enticing and it also has a high crime rate. Northern Mexico is just nuts nowadays and could be interestingly rendered.
It be also interesting to have a Hispanic guy as the main protagonist of a GTA game.
I do still have to play Lost and Damned and Ballad of Gay Tony in the meantime.