Lol at Halo not having a huge impact. Why do you think the Xbox is even around? Halo.
Halo CE was the reason to own the OG Xbox, and Halo 2 cemented that. Halo 3 was the reason the 360 had very good sales at the beginning of it's life (they had at least 8 million users (Halo 2 fans) to sell to at the time). Halo MCC will bring back some of the Veterans so they can transition to Halo 5 easily, and then when Halo 5 launches, sales will be ridiculous.
Halo has always been record breaking when it launches, and Microsoft will do whatever it takes to make sure Halo 5 not only sells to the existing player base, but brings in new players.
Won bet with t3mporary_126 - I correctly predicted that the Wii U's LTD at the end of 2014 would be closer to 9 million than 10 million. http://gamrconnect.vgchartz.com/post.php?id=6673287
