Then I bootstrapped my project myself and it was enough of a success to allow me to not work... It could have been a far bigger success with funding.
I believe it's more about the comfort of regular employment which is more and more cozy and attractive (including from a financial perspective). Startups are risky and intense and for a lot of people the extra stress just isn't worth it. They can be happy with a regular 9-5 job and more free time for fun and hobbies.
Culture is another thing. Society does not value success as it used to be, the self-made rich are reviled while luck, conformity and integration in society held in high regards. Unfortunately this comes exactly as future's challenges can only by solved with courage and entrepreneurship...