That is a fair question, and a "what if" type so its hard to answer. if you assume an ideal world with sane CEOs than it shouldn't matter what the investors expect. The startup should burn cash at an optimal rate to achieve the highest profit. Of course don't live in an optimal world...
Would those 80 still have failed if the mindset was "get 5x returns" rather than the current "get 100x - 1000x returns"?
My gut says the demand for high-returns results in "total failure" in many cases due to insane burn-rates in quest for "hockey-stick growth"