Or get married to someone who can support you while do something risky. If the Korean immigrant with a wife and kids who starts a dry cleaning business in your neighborhood can do it, then it can't be intractable.
1. You assume because a "korean immigrant" can do something, that it must not be intractable (hard). Immigrant entrepreneurs are usually highly motivated, especially the kind who start small businesses. I would rescind that comment.
2. You are comparing a dry cleaner to a startup. The failure rate of startups is several order of magnitudes worse than a dry cleaner. Figuring out the potential numbers for a dry cleaner is simple math that you can base on the local population, income/employment stats, and # of dry cleaners. Most startups would kill for that kind of estimate.
Or he assumes that integrating yourself and your family into a new culture, quite possibly while learning a new language, are both difficult problems which the OP would have the benefit of not having to overcome.