It seems to me that risk taking is probably deeply cultural, and is also likely effected by both policy and economic status (collective and individual status). It's probably hard to know how to quantify all of these different effects, but I hope some people are trying to research this!
Culture is not that hard to change when there is money involved. The difference in SV is that there is so much venture capital willing to create new companies. Given that amount of capital, there will always be someone willing to do it.
Doesn't it seem a bit old fashioned that venture capital should be geographically localized, as if it were a physical pile of gold? Is that not on its way out?