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I gave it some thought and I would be surprised if they withdrew.
It's inconvenient for the Russians to siege it, keep it surrounded, prevent attempts of breaking out. They would be jumbled up around while HUIMARS-es could pepper them. It would cost them time, people and resources.
Meanwhile pro-Ukrainian propaganda would hail the besieged, could make good use of the heroes, could push for the fighter jets. They could claim if West supported them the defenders of Bakhmut wouldn't be in this trouble. Just label pro-Russian those who question the necessity of the human sacrifice, that would shut them up.
So there are many pros to leave the troops there.