For one, I'm not sure Sam Altman will tolerate MS bureaucracy for very long.
But secondly, the new MS-AI entity can't presumably just take from OpenAI what they did there, they need to make it again.
This takes a lot of resources (that MS has) but also a lot of time to provide feedback to the models; also, copyright issues regarding source materials are more sensitive today, and people are more attuned to them: Microsoft will have a harder time playing fast and lose with that today, than OpenAI 8 years ago.
Or, Sam at MS becomes OpenAI biggest customer? But in that case, what are all those researchers and top scientists that followed him there, going to do?
Interesting times in any case.