Of all the games coming out that people say will kill destiny, the one that will definitely be taking [i]the cake[/i] will be half-life 3.
Sure Halo, Call of Duty, and Fallout all have incredibly huge fanbases, but so does half-life. It won multiple awards so far and is the most anticipated game of all time, so half-life 3 will probably be the greatest game to come out up to this point.
Might as well use your new and improved gravity gun to pick up destiny and throw it out your window, because half-life is love, half-life is life.