You could've said the same thing about Google (specifically their AI efforts) 5-10 years ago, and what ended up happening is the majority of their best engineers left for other places like...OpenAI.
I agree I don't know what will happen. But apart from PR (and arguably funding) OpenAI really doesn't seem special. I say this as someone who interviewed there and with competitors. And many people in the field have developed a distaste for OpenAI's management over the years to the point it's becoming a problem with recruiting.