Thats what adopting full grown adults as sons is for.

Look at it this way, how many families have the reliability of a thousand years streak of employment? If it ain't broke...

It's important to have assets. If the family business is an asset with opportunity to grow in value, by all means the next generation should be overjoyed that someone built something which they now have an opportunity to take over and continue building. Not all family businesses are like this though, as people in general are weak and wretched; family business owners can easily ruin themselves and their descendents by going into debt, or embezzling money away from the business to fuel personal vices which invite poverty and instability.

As with many things in life, the make-or-break factor ultimately falls upon how well the parents have matured as human beings, and the quality of the upbringing they've given to their descendents. So I would say it is impossible to make a rigid, universal determination one way or the other. All I know is I would do anything if my parents or their parents asked. Anything.

Well, in some respect, that is the strength of culture. Culture is a software that controls what people do, and what their country becomes (to some significant extent).

For some purposes, such a culture is very restrictive and discontent-inducing. But for other purposes, this culture might help you survive through long problems and dangerous situations that might kill off a people who believed in doing whatever you want and bailing when things get hard. It really depends on the environment that it operates within -- this is not a statement that a particular culture is "better" in every case.

Side note, this is why, as a visitor to Japan, you get to enjoy all the benefits of seeing the examples of what discipline (and inflexibility) can bring -- but you would go crazy and not be happy if you had to live there.

Hell no!