Dear Bungie,
Let everyone appreciate your hard work and in the next patch toggle team chat on for everyone. Look at your stats, no one uses it because no one remembered to or even knew how to, and because no one is on, those who know about it don't use it. Additionally, fireteams who'd like to use team chat should give team chat permissions to the fireteam leader. Having to remind players on your fireteam to individually switch over after dying in crucible is a pain, only to find no one outside of your fireteam can hear it.
Show off your hard work and make team chat work like it does for halo, advanced warfare, and nearly every other great pvp shooter out there.
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Few use it because few actually want to talk/listen to randoms. If it was on by default, then id turn it off. I can stand the visual annoyance of text chat randoms, but not the audible annoyance of voice chat randoms.