Scheduling debates on a weekend doesn’t stop people from watching them, especially in this age of Youtube and other internet video services that allow them to watch the debate whenever they want, so it is unfair to say that the Sander’s campaign was sabotaged by that. To my understanding, there was one known case where Donna Brazile fed the Clinton campaign a debate question. She should be punished for that along with anyone who knew, but that should be the extent of it.
We live in the age of Trump. Yes, we want to improve the Democratic Party’s process, but abandoning the party means surrendering the nation to Trump. That is a morally untenable action. Imperfect as the Democratic Party may be, it is still far better than the Republican Party right now. Tearing the Democratic Party apart is basically giving the country to Trump. That cannot happen if we truly care about our future and our children’s future.