When people say "jobs" they usually mean "access to an upwardly-mobile career path".
Most of the goods and services that I purchase, anyways, are enabled by some sort of expensive and heavily regulated infrastructure. Every physical object that I buy was produced by a factory and purchased at a large retail outlet. The main services I pay for are communication-related (cell phone, internet, etc. - huge infrastructure there), automobile maintenance-related, and liability-related (e.g. insurance), medical-related, and the occasional meal at a restaurant. The only ones of those that one can do as a small business are automobile repair and food services, neither of which are the first things I think of when I hear "upward mobility".
Basically every highly-upwardly-mobile profession relies on expensive infrastructure (communications), access to an enormous pool of money (insurance), good relations with government regulators (law, medicine, insurance, communications), access to a large distribution channel (retail), or manufacturing (retail). There are some peripheral service professions (advertising, real estate brokership, stock brokership), that rely on having a good relationship with a wealthy clientele, not to mention a good relationship with regulators.
Basically, upward mobility relies on existing infrastructure of some kind, and if someone who isn't you and doesn't like you controls it, you're fucked.
So, you know, they could write web apps, since no one really controls the internet. Maybe. And they probably won't get VC funding. Or get bought by a company, unless they're really profitable. Or get advertising deals.
It's only in web app land that 2) is possible without manufacturing, and the Japanese are at a steep disadvantage because of the language barrier.