This is a writing prompt, obviously.
If Bojack was not born they would have never married and bojack's mom would have married Corbin Creamerman.
I agree with what HorsemanBo69 said, yeah they wouldn't of stayed together. They would of had a good year at most before she got over him. Them having Bojack kind of forced them to stay together.
Also, like some TV Shows (SpongeBob, Twilight Zone, etc.) that are very popular influence a lot of pop culture and people. Like for example, Mr. Peanutbutter became popular off the same trope Horsing Around was. So who knows where he would be.
Well, as other people have commented, they wouldn't have stayed together. My impression from the episode "Time's Arrow" is that what happened between Beatrice and Butterscotch wasn't meant to be more than a one-night-stand (if I'm wrong, please correct me). They most probably wouldn't see each other again. So, I imagine Beatrice would go on that second date with Corbin and would have married him eventually. From now on, she would live that comfortable lifestyle she was used to and have children, as was expected at the time. Being with Corbin would have two different results, judging from what little we know of him: either her toxicity and self-loathing would have lead to her not treating him and her kids very well, or Corbin would help her get some therapy and she would help him be more confident. Perhaps he would have supported themore progressive ideas that she appeared to have in her youth and together they would be activists and philanthropists, or even let her work for the company!
As for Butterscotch, we know he was a terrible writer, so I doubt he would have become a famous author or anything. He would still write the book, or at least try and find some other excuses as to why he couldn't finish it.
Also, since Butterscotch and Beatrice would have never gotten married, Butterscotch would have never knocked up the maid and Hollyhock would have never been born. So there's that!
What do you think?