I think it will depend on who holds out and / or she picks for VP. If the consensus is overwhelming for Harris, most will keep their powder dry.
I could imagine the progressive left raising cain about it but then again, they showed remarkable discipline for Biden.
The key I think is to not let it look like donors or elites are dictating. I actually think the line that this is all driven by elites is potent and frankly, I am not sure how to address it.