(Meta: the order wasn't important, thanks for thinking about that though)
The selection part is something else I was thinking about. One of my thoughts was your "If there's no way to train PhDs, they die out." And the other was me being a bit skeptical of how big the pool would be right this second if we adopted a really thick skin policy. Reflecting on that second point, I realize I'm drawing from my day to day distribution, and don't have thoughts about how thick skinned most LW people are or aren't.
In light of reading through Raemon's shortform feed, I'm making my own. Here will be smaller ideas that are on my mind.