Hmm, you might think too far. The game isn't even out yet and you already know the bugs it's gonna have.
First of all, mw2 had that bug, it will be probably patched. There will be a private beta + you can test it at the reveal on September 2 & 3.
Secondly, if you look at the survival reveal trailer, at 1 min 47 you can clearly see that riots can break after a couple of damage.