Sorry, I wasn't intending my posts to come off as aggressive. I kinda wrapped yours and ProvenDeadly's posts together (he was using "majority" and "hardcore" in his previous posts).
I can understand leaving a series because it takes a direction you dislike. I pretty much did that with Quake around the time of Quake 4. Wasn't feeling it at all, and so I mostly just got back into playing on consoles, and fighters which I had neglected for years due to play Quake III Arena almost exclusively. The thing is though, is that some of us back then instead simply stayed with Quake III Arena (which has always been an option for Halo 3 fans), similar how others before us stuck with Quake 2, and Quakeworld before that. Quake 4 definitely diminished the popularity of Quake, but reverting back to what was popular once before doesn't necessarily make it popular again today. Quake Live despite pretty much being Quake III Arena reborn, only brought me back on temporarily, and the overall numbers speak for itself. We're not the same people, and can't turn the clock back. I think Halo is in a similar place right now, and honestly think it would result in Halo 4 likely being the most populated today even if the game had launched flawlessly. I can imagine one the other hand that the stats would have been very different at launch with many people coming back to try and relive days gone by... but I can imagine many of those returning to their current games regardless. I don't think there's some strange correlation of only Halo 4 players not dropping the game and selling their shit off... they'd be just as like to jump ship to CoD and Battlefield as anyone else imo.