If they didn't reinstate Sam, Microsoft already threatened to cut off all future funding from OpenAI, (they've only paid 1 out of 10 tranches so far), then sue them, then help Sam poach OpenAI talent at his next venture.
> The plan some investors are considering is to make the board consider the situation “untenable through a combination of mass revolt by senior researchers, withheld cloud computing credits from Microsoft, and a potential lawsuit from investors.