I think thats cool and all but I can think of two issues
1: compromises a couple gameplay elements
2: lots of squeakers
for those who don't know, squeakers are children, usually under the age of 12, who play online video games and tend to be rude and obnoxious, scream into their mics, and play poorly
on the other hand, rated M or not, most children who want to play this game, will anyway.
Also, VOIP is off by default, but I intend to play with VOIP on. And I would prefer not to have some little kid screaming into my headset.