Jenny's route was finished in 2018, so nothing for her since (and probably nothing more), aside the preg scene in batch 1. Nobody votes for Debbie's remake, so it'll never happen. Dev didn't "bit more than he can chew", you just have to know how the game/updates work
Game was build on the incest theme. The whole premise was about it. But let's take a look at all the characters with introductory scenes only:
Judith
Latino twins
Gym teach
Thin friend of Roxy
Yoga instuctor
Lifeguard girl
Black girl who swims
And I am sure many others I've forgot
And there is no ending for any of the other already established characters either. Mia, Diane, Debbie, Jenny, Erik's mother, Roxy, her friends. They are all just like in stasis with no clear end in sight.
The game is only about half-way done simply by virtue of tying off lose ends. Even if none of the characters receive much expansion on their routes there are simply too many questions left unanswered.
Then there is a new storyline about pregnancy lab or smth. That needs it time in the spotlight too.
When did this game start development, 2016? Almost 7 years in development?
My most hopeful prognosis is another 3-4 years. Long enough to celebrate it's first decade.