According to a recent post on the Gears of War forums there is plans to remove the “Smoke Stun”. Cliffy B and the rest of the Epic Crew plan on doing “Tests,” to see whether or not they should remove the Smoke Stun, or take it out during certain days (ie: Smoke Free Saturdays.) All Evidence does suggest that a change will happen to the smokes:

Originally Posted by CliffyB 
We have the option of disabling the ragdoll concussive effect entirely or replacing it with a brief cringe. We can remove it entirely or simply have “stun free saturdays.” We’re going to do a few test days where we see how people feel about the reduction and/or removal and then adjust accordingly.

Stay tuned.

p.s. I do love you all.

[Source]