This would be a nuclear option and, in reality, probably would do more harm than good to SpaceX,
It would probably set back their more ambitious targets by decades. But even Starship is now far enough along to no longer really need Musk's stewardship, and the US government would be happy enough just with control of the Falcon programme. They don't care much / at all about Making Life Multi-Planetary.
So I consider a move like this pretty plausible.
Interesting! They're talking about unnecessary aborts, and how they want to do as much analysis as possible of the abort criteria, to prevent them.
This will remain an issue for Flight 6 which, it seems, will happen the moment SpaceX decides it's sufficiently ready. Unlike previous flights ...
"Given this is the first launch in a long time ... well really ever ... that we've not been FAA driven ..."