Quote from ThrikI think it could be good for the storytelling. There's been so many GTA games now, if I have to go through another 'rags to riches' story I'm going to end up killing myself. It'd be a really interesting twist if you played as both a 'rags' guy and a 'riches' guy, especially if they clashed with each other and a narrative was built around their interactions with each other. They could even go 24 on our asses and have you play the same missions from both perspectives, with 24-style split panel framing to show what the other guy's doing.
OK getting carried away and will most likely be disappointed with the reality now.
I liked the style of GTA4 and it's DLCs. The main game was one char and each DLC featured it's own. But all their stories intertwined on a few occasions, which was pretty cool.