Is there any way it could happen to reach 100k-200k again?
The only way is if halo 4 sucked completely what do you think?
Its only a dream...that will probably never ever come true!(hopefully it will)!
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Unless the servers for Halo 3 are going to be shut off at a an announced date in the future (like what happened to Halo 2), I'm certain that Halo 3 will never become populated/popular like it was in 2009 or 2010.