While HN would seem extremely pro - entrepreneurship, in reality, starting your business is not always the smartest move, not from just personal perspective but from perspective of a nation as well. Sure you want Larry Page and Sergey Brin to create Google but before that they went to Stanford for Ph.D. in CS. Entrepreneurship just for sake of it and without any good idea is no better than playing stock market with different strategies.
If 15% of the unemployed engineers in Corvallis could start companies that hired 5 full timers, they would (probably) have a booming economy all over again. Shit, maybe we could start exporting to China (I think they value entrepeneurship and industrialization there...).
You highly overestimate success rate, also what would they sell? What if they compete with each other and end up cannibalizing the market share between each other. That would at most create re-distribution of wealth and not generation.The only way to generate income is via means which are non zero sum games [at least non zero sum within that nation].