And while that might hurt OpenAI as an institution more than it hurts Microsoft as an institution, the effect on Microsoft's top decision-makers personally vs. OpenAI's top decisionmakers seems likely to be the other way around.
Amateurs on hugging face are able to match OpenAI in impressively short time. The actual former-OpenAI engineers with unlimited budget ought to be able to do as good or better.
Not to mention, after that, MSFT might be left bagholding onto a bunch of unused compute.
All Sam and Greg really have is the promise of building a successful competitor, with a big backing from Microsoft and Softbank, while OpenAI is the orphan child with the huge estate. Microsoft isn't exactly the kingmaker here.
Most likely outcome here does seem to be that Altman/Brockman come back, Sutskever leaves and joins Google, and OpenAI becomes for all intensive purposes a commercial endeavor, with Microsoft wielding a lot more clout over them (starting with one or more board seats).
Big winner in this scenario would be Google.