most post-bubble bagholders would sell as soon as they can break even if they could to get out of this mess
That's actually one of the bigger issues of the near future.
Depends. If their break even is met during what seems like a price explosion, then they're likely to be caught up in the mania and not sell.
If it grinds slowly up for months then perhaps lots of rises will be dampened by people getting out. There's only so many though.