Actually, Your MOM, you yourself are making quite the assumption that these factions will never share tension. None of us know the game's full storyline, and while it is true that all humans are working toward a common goal, tension within humanity is natural and generally inevitable.
Also, tension between seemingly amicable characters usually heightens the entertainment of a story. For example, some of the best aspects of The Avengers movie was the tension and bickering between the superheroes, despite working together for a common goal.
Such tension can elevate the plot and make the game more interesting, so never discount the possibility, especially when we know so little about the game.
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You are very right. There may be tension between groups, that tension may lead to small battles between groups, but I don't see that happening frequently and having it be a central aspect of the game.
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No, you're right, it probably won't be a central aspect of the storyline. However, I could see warring factions suddenly complicating a standard mission, for instance.