If anything, Snapchat's popularity is growing!
Yeah, the boring running around doesn't cut it anymore though. Like I said, nothing as drastic as AW, but it needs to have some changes. I think an increase in the time to kill and the addition of dashes alone would go miles for CoD. I really believe that it was the crazy jumping that really threw people off in AW. At the same time, it's not just the movement that made AW feel bad. Overall poor mp balance and generally subpar map design really hurt it. The last two CoDs have been very bad in these things, but Treyarch is better than the other studios at both of them, so we'll see.
Play Titanfall. The game's core movement and mobility feels amazing. The next CoD needs to feel like that, but obviously not necessarily play like it.