a dark epilogue for rectify
I don't know about you but I found the season 4 finale and most of season 4 cringe inducingly happy. Here's some very pessimistic but plausible outcomes which might happen to some/all of these characters. Read at your own risk.
Daniel: Daniel finishes the book Chloe gave him, but she barely remembers him. Awkward pleasantries ensue and they never speak again. Daniel spends the next few years working hard for low pay, basically homeless. Despite therapy he still becomes unhinged like he does multiple times in the series which holds him back.
Ted Sr: His son's divorce changes his outlook on marriage and he makes less and less of an effort with Janet until they finally separate. He spends his remaining years riding in taxi cabs telling them to drive him to historic places.
Janet: Despite being told to let go she becomes more and more consumed by caring for Daniel and distances herself from the rest of the family, while also feeling more and more guilty about it. Eventually she is committed after a neighbor finds her redoing her kitchen and cleaning the fridge over and over.
Teddy: Teddy is successful in a new career but no longer feels the same drive to succeed like he did with the rim rental business, nor does he make the effort to maintain relationships like he used to. He ends up having many flings but never has a family of his own, and his closest friend is Melvin.
Tawney: Eventually after the reality of her new vocation sets in she loses that faith that she was destined to do it, and having sacrificed most of her family and to achieve this, she ends up similar to the old man with no family around her at the end, asking for her plaque.
Amantha: After working at Thrifty town for a huge chunk of her life Amantha loses her job when the store is replaced with Walmart. She spends the rest of her life wondering what her life would have been like if she hadn't moved back for Daniel at the beginning of the series.