A lot of things have changed since then. Requirements and competition for positions have increased exponentially just as salaries have skyrocketed in the more technical fields. No surprise there, but that competitive pedigree system has filtered all the way down to primary and secondary education (to say nothing of college systems).
So it is the end of the world? No. But it will cost you tens of thousands of dollars in the near term and perhaps hundreds of thousands of dollars over a lifetime in lost potential earnings. Slipping out of the higher level schools can also make it extremely difficult to get into specific companies.
As for entrepreneurship, that’s also subject to the same issues. Sure, anyone can start a company if they want, but if you want to fund that company the path is much easier if you went to Stanford than say Oklahoma State.