After all these patches and changes I think it'd only be fair to start again with a clean slate. For example, someone's KD would've been a major factor before the Nerf of a Vex Mythoclast. This way everyone plays with the fair version of the gear.
Also, for the new people who joined the game this past month and are just leveling their characters. Its not fair for us to make fun of them because they're new. Again its only fair.
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Why would they wipe the characters? As they showed in halo 2 and 3 bungie can just wipe the stats clean. They did it in multiplayer every time a new aspect was introduced. So let people keep their characters and just start with fresh stats