Incredible lows today, 2.3k earlier, and right now 4k.
From my experience with other AAA games in this industry, this is it. This is the point of no return for games.
Highguard and Concord both had more players than Marathon did when their plugs were pulled, and just about every other game I've played facing shutdown has had more players too.
The only saving grace for Bungie, is that Sony may not want to dissolve such a long standing studio. But then again, that may be the only way Sony recoups anything.