I'm thinking that the main reason why the Halo 3 playlists died down is because of the fact that Halo 4 came out. As soon as people get tired of Halo 4, the playlists will make a comeback. We all hope, anyway.
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Sorry mate, but there's a higher chance of people going to other games instead of returning to game that's nearing it's grave. Halo 3s time is sadly over. There's more games popular FPSs to play now compered to five years ago. I love Halo 3 and have spent most of my time playing it but now I prefer to play other games (BF3, BFBC2 and Reach). [Edited on 01.01.2013 6:01 AM PST]