Good idea in concept. Except for the fact it only applies to low population area's with minimal action drowning out that talking noise. Else its just more ambient scattered sounds. The videos show their only real tactical application (stealthy, low population situations), assuming anyone bothers using the in game voice service to "gain" this dis-advantage.
I'm not sure that the depth it adds is worth hearing
12 year old kids screaming obscenities wile they chase me down with their max equipped with dual melee weapons.
Que robotic veloci-raptor nightmares with benny hill theme music.
(also, with so many players in such close quarters, this might add an unnecessary amount of network traffic)