Yeah concurrent players on Live are way down on last year, probably a mixture of franchise fatigue, the industry as a whole declining and some things that are specific to BO2. I think one of the problems is that they've really focussed on the competitive/esports aspect of this, I really don't know why they've gone down that road when 99% of their playerbase doesn't give two shits about it. I think Vonderhaar, during the last two years, has been influenced by the success of games like Starcraft 2 and LoL in the esports arena but hasn't realised that COD isn't that sort of game and the majority of the playerbase doesn't want that type of experience from it. Take the maps as an example, probably really balanced for MLG dom or ctf games but frankly, overall, boring as mud compared to previous games. The killstreaks are tailored to objective based game modes when by far the most popular playist, over the last five years, is TDM, Where now dogs are a 17 killstreak and a bog standard chopper is 11. Even considering assists it's a major nerf over previous years. That's not to mention the complete fucking over of FFA when it comes to killstreaks but that's a little pet peeve of mine heh.
Anyway bit of a rant, I still enjoy the game overall and the patch seems to be spot on in terms of balancing.