On the first line what do you mean by "The thing is that people didn't lose interest in startups. Startups lost interest in people." Or what, differently, do you want startups to do? (I"m genuinely asking, I'm curious!). I'm all for things like longer exercise windows, insourcing, etc, but I also think that startups, generally, have a much more inclusive brand of capitalism than most normal companies.

As for the rest, I'm not sure I follow the argument. I do not agree with the notion that every company that succeeds but has gone through YC would have succeeded without YC. I also don't agree with the notion that only companies that are going to succeed either way go through YC either. Empirically the latter is more easily falsifiable but I think both are false.