I don't see that happening at all frankly. I get killed by run-n-gunners FAR more often in RO2 then in RO1. In RO1 RnG wasn't very effective because you couldn't hit anything while moving, the only way you could hit anything was to stop for a few seconds while crouched, or better, brace against something. Getting spotted in the open by someone who was braced almost always meant death. In RO2, you can sprint into a building and blast anything you want with perfect accuracy while moving. Getting caught in the open is death 50% of the time, since you can just ADS while standing and get just as good accuracy as the other guy. I actually had to speed up my gameplay in RO2 to stay competitive. In RO1 I used to take it very slowly, but you'll often get ambushed and outflanked by RnGers in RO2 if you take it slow.
This ^