Nope
I think the freshness of Black Flag will have helped keep AC from falling and now it's next-gen only it may help the next-gen sales.
But the one concern is the affect of Watch_Dogs. Basically, it wasn't as good as we're hoping for, so there may be a decent amount of scepticism around their next big game.
But the lack of a last-gen version will mean that Watch_Dogs will sell more, but I reckon 2:1 at most