I dunno. He technically just enabled Sarah Lynn's death, but between that and Penny last season, Bojack seems to be aware he's at rock bottom; the fact he's now suicidal seems to cement that. He's at a point where he will inevitably kill himself if he doesn't change his behavior.
Besides, I remember the writers stating they feel the same way; not winning the Oscar/having a panic attack around a new kid actor was a nice way to wrap up Bojack's character arc. Meanwhile, Diane, Mr. Peanut Butter, and Princess Carolyn all seem to be facing disasters, and Todd's future seems up in the air. My guess is we'll see a small, slow, but nonetheless noticeable turnaround for Bojack next season, and that'll be his new arc. He'll still be an ass, but he'll finally "be better." Meanwhile, the drama is almost certainly going to shift to Diane's new boss and Mr. Peanut Butter's run for governor crashing horribly, with a side of Princess Carolyn realizing she sabotages herself without Bojack around. And... Todd seems out of the picture right now, but Aaron Paul's an executive producer on the show, and he's a fan favorite. They'll find a way to bring him back into the main story. He's the comic relief so I'm assuming he'll just latch onto a lighter storyline, but it'll be a new season so who knows?
