Earlier quoted context omitted.
I haven't looked too much into this space, but what about this rationale: the existing model pushes startups into 1000x-or-bust behavior, which contributes to the low success rate, which reinforces the need for high-risk growth followed by a spectacular cash-out. This could be driven by many factors, not least of which is the "brand name VC" model in which venture funds need a couple household name home runs to attra…
I don't understand. The "model" isn't the creation of venture capitalists; it's just mathematical reality. Whether you're shooting for 2x or 10x returns, the odds-on bet is that your company will fail. That's what new companies do. It's true of tech companies, barber shops, and restaurants. In a cohort of failing companies, the returns from successes must be higher to subsidize the losers.
Only if you invest in startups they way you play craps. The statistical distribution of outcomes is not predictive of the chances of a particular startup succeeding or failing. Some founding teams are virtually guaranteed to fail; some have a better than even chance to succeed. If you are willing to give up on the unicorns you can also eliminate most of the duds. Valley VCs are not willing to do that.