The PR hit will be bad for a few days. Good time to buy MS stock on discount but this won't matter in a year or two.
I think when people say "takeover" or "coup" it's because they want to convey their view of the moral character of events, that they believe it was an improper decision. But it muddies the waters and I wish they'd be more direct. "It's a coup" is a criticism of how things happened, but the substantive disagreements are actually about that it happened and why it happened.
I see lots of polarized debate any time something AI safety related comes up, so I just don't really believe that most people would feel differently if the same thing happened but the corporate structure was more conventional, or if Brockman's board seat happened to be occupied by someone who was sympathetic to ousting Altman.