They will settle the shareholder lawsuits (and probably make Twitter Inc. and therefore the shareholders themselves, pay for it).
Because if they do anything Elon’s gonna threaten to make their lives miserable in many different ways. And they are all gonna fold.
They didn’t become board members to protect shareholder rights. They became board members because it’s a cushy job that pays well for little work. And gives you some street cred. Getting into a fight with Elon threatens all of that.
So yeah, Elon’s bullying and tantrum throwing will win again because the only entity that can fight back, the US govt, has decided for a few decades that it really shouldn’t be doing anything.