Doubt it would be exclusive. The original was not a success so there is no reason for moneyhatting.
Just Cause was one of the games that you play and think to youself: "It's crap, but with a little more effort in mission design, it could spawn a great sequel" (see also: Assassin's Creed - although I kinda liked what little I've played).
At least it had some ideas that weren't ripped-off of GTA, unlike Saint's Row.