With the upcoming release of Halo 4, I assume that many Halo fans will shift there attention to the latest game. Hopefully, there will still be some Halo fans loyal to Reach. I just hope that the numbers don't drop as low as Halo 3. Can hardly find a game anymore.
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I think there will be a few that stick around. I certainly will come back for the nostalgic feeling. I'm sure there will be a good enough people to get games in certain playlists. Here's hoping. :)