6. Call of Duty
A franchise that almost totally defines linearity, open world is one of the only real ways I can imagine the series' single player getting any innovation. Multiplayer would just be complicated by this change, and I sincerely doubt Activision would let their cash cow multiplayer get modified to such an extent. That said, the campaigns of CoD could really do with some fresh material, and an open world structure may just be the ticket.
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