Breeding Season didn't have to die. H-Bomb had all the code, and as anybody looking at us can see, you can push out a lot more art than you can good, bug free code in any given time-frame. Spurple just bailed on a sinking ship after everybody else on the team told him they were going to leave at the end of July 2016 anyway from being fed up with H-Bomb.
H-Bomb still has all the rights to the code. He had a patreon turning out 41k a month and suddenly no longer had anybody sucking up any of it except himself. He could have gone and gotten a quote from literally any NSFW artist or animator on the net pretty much and been able to pay them to fill in all of the blank boxes left behind by Spurple pulling the art. (Hell, with that much income he could have put himself through art-school and done it all himself if he really wanted)
He didn't. Like S-Purple and everyone who has ever actually had any experience with H-Bomb knew he wouldn't. Because H-Bomb didn't actually do any work, at all, except push changes, send out stingy paychecks, and then go off to fuck around with 50% of the income every month.
Breeding Season didn't -have- to die. All S-Purple did was force HBomb to actually go out and find new people if he wanted to keep going, rather than leave the thing up to keep generating income off of S-Purple's art while not actually working on the game at all.