Procedural obstacles and whatever aside. Neither would be confirmed. I'm actually kind of surprise neither have been fired, particularly Blinken. The whole point of someone like him was to restore confidence in a less politicized and more professional and competent Government after the Trump debacle. This has totally destroyed that perception.
Blinken has worked for Biden for almost twenty years, going back to when he was still in the Senate. My assumption is that he's high in Biden's confidence. But I wouldn't be surprised if neither he nor Austin managed to survive to 2024. Many progressive Democrats were skeptical of Blinken when he was first nominated by Biden.
Was this a thing outside of some on Rose Twitter? Because IIRC, Faiz Shakir was literally the biggest praiser of his nom.
Blinken, when he was nominated, was praised by many in both sides of the aisle, and probably a lot of progressives.