Ok. So my brother and I were talking about this and wondered how long will destiny be truly fun? We already know reaching the level cap of 20 will not be too terribly difficult and replaying old areas once your a higher level is not nearly as fun. Borderlands solution was enemies level up alongside you but that isn't really possible in online game such as this. So when the story is done, you've reached the level cap, and crucible has lost it's charm, what then? DLC's maybe?
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Don't quote me on this, but I think that once we make it to 20, it's going to be a bit like DCUO(DC Universe Online) where once you reach 30, you have to worry about your CR(Combat Rating), which is acquired by getting better armor as you progress through the more end game content. You all should look into it if you're curious: )