http://kotaku.com/the-messy-true-story-behind-the-making-of-destiny-1737556731
Many of us have wondered what the heck happened to the original Destiny concept from years back and what role Activision had in the shadows of development. Well, here you go. Enjoy.
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The rumor inside the rumor is that the original story was actually scrapped because it was deemed too complex for the Teen audience they wanted to attract. The complexity of the original story and the trading / gambling aspects would have meant a mature rating and therefore limited the potential audience. See? Simple Story + Simple Mechanics + Kids = Profit.