Advice: you can't win over a narrative, which is what Sam has become. People and resources will come to him, by themselves.
If I was OpenAI I'd want to quit today not because I want to follow Sam, but because the same bullshit that people left Google Brain et al. for has managed to catch up with them at OpenAI. It's a shame honestly, it was so exciting to see a company finally free itself of the shackles of navel gazing and just build things, but it seems like that's over today.
The narrative I am referring to is a simple one: take back what should be his. A.k.a, revenge. That is for sure a strong word.
People live on stories (collective imagination, if fancier), and what they like most is a wronged prince/princess took back his/her crown. It is the same with Taylor Swift rerecording her albums. The story potential will feed itself, until it is fully realized. The OpenAI board had committed a historical misstep, but maybe it is indeed what it is designed for: they hold no stakes in the business, so their view can't be held accountable in a business microscope. But money will really dislike it.