Even if Roseanne hadn't made that tweet and hadn't been fired for it, how long do we think she would have lasted on the reboot?
In the reboot pilot, apparently she had it in her contract, that she was allowed to say "Thank God for Donald Trump". One of the main storylines of the first season was about Darlene's son possibly being trans, and the character of Roseanne was supportive of him.
I felt like the writing on the new show was horrible.
In Season 1, Becky wants to sell her eggs, and she's told that her eggs are too old. Then a couple of years later, she has an accidental whoopsie pregnancy (in her mid-40s, with expired eggs!) from a one-night stand, with an undocumented immigrant no less. It seemed like a long-winded way to work in a storyline about forced deportation.
But I think maybe the show got a lot of complaints about that storyline from viewers who were struggling with infertility. Because suddenly, Darlene, who had never talked about wanting more kids before, wants to have a baby RIGHT NOW. Even though she and her husband, both in their mid 40s) don't have their own home, and they live in Darlene's Dad's overcrowded house, where her son Mark lives in an alcove because he doesn't have his own bedroom. And she's always worrying aloud that she can't buy Mark the school supplies that he needs to succeed in school. Then she's crushed when a doctor tells her she can't have any more kids.
Many storylines didn't make sense. Darlene has a perfect man, and she cheats on him multiple times? Becky had a personality change from the original series. Worst of all, they fired DJ after refusing to give him storylines. Bizarrely, they kept the actress who played his daughter after dumping him. Then she disappeared too after a few episodes. I think that if Roseanne had been on the show, she would have campaigned against them dumping Michael Fishman, who had always been loyal to the show.
The show tried too hard to be politically correct that it felt like an after-school special for adults. The storylines were too depressing, and there wasn't enough humor (like in the original show) to balance out the gloom. It just wasn't funny.
In Joan Collins' biography, she talked about guest starring in an episode of Roseanne in the early 90s. She said the writers seemed on edge and terrified at Roseanne's wrath. According to Joan, at a table read, Roseanne told the writers, "this is shit" and made them rewrite the episode. Would she behave the same way if the reboot went on longer, since the was the title star of the show, even though Sara was "in charge". Or would she eventually have bitched out Sara and the writers, or would she just have read her lines, collected her check, and gone home?