I feel like doing a startup in Japan is not yet cool, from a general society perspective.

I think that almost every one of these new founders are having regular arguments with their parents, who would be trying to convince the founders to get a "real" job at a "safe" company.

Having said all that, I agree that inexperienced people often give up at the first speed bump. As Steve Jobs said:

“The problem with the Internet startup craze isn’t that too many people are starting companies; it’s that too many people aren’t sticking with it.”