This graph illustrates the percentage of startups still in existence after 10 yrs (92-02).
— Via smallbiztrends.com
The failure rate is pretty astonishing and, I would think, would deter most people from starting a company (which it probably does), but it also makes the obstacle to starting a company so high that it becomes very attractive to many.
And, I would think these numbers haven’t changed much over the last 6 years (well maybe it takes longer for an Internet company to die since it also takes much less capital to start one).