Eh, I guess. Maybe it's the PS crowd, but it's honestly not an issue where I play.
Maybe they should just make this one of the many host options so that those who want to have to push a button to talk to their team can have fun playing by themselves while all of the intelligent, mature people enjoy a game with open communication?
Either way, no matter if it's push to talk or open-mics, you're still going to have the people you don't want to hear that you'll have to mute.