That's obviously not true. Destiny cannot be killed by another game but just by itself, and that's not going to happen soon !
So anyway, while waiting for the great Iron Lords, I tried Paragon. And that was surprisingly fun :D It's free and in open beta right now. If you haven't tried yet, it's like a TPS/MOBA style game. It can keep you busy until the 20th September ^^
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You know what else will kill destiny? [spoiler]Super Mario Sunshine[/spoiler]