You'd be surprised.
Edit: Destiny Tracker suggests there have been over 8 million active users in the past 15 minutes [across current gen and past gen].
Edit: 76% of which contributes to the Crucible.
-
Yeah, but that's like 4 guys with 2 million accounts each. This game is dead guys. Accept it. [spoiler]Do I even need to put a sarcasm tag here? Probably. But I won't. [/spoiler]