Yeah, the main roadblock in Japanese, (and Korean in a few years down the road) is that a lot of their agricultural production is coming from an increasingly elderly population that has had very little younger people joining to make it sustainable as the generations age out. This also ties into the heavy urbanization of their populations and the steady abandonment of the rural life in conjunction with declining birthrates and the average parenthood age growing due to a lack of financial stability which in turn is tied to the fact that Japan's economy has been stagnating as the effects of its switch from and industrial production economy to a consumption economy has finally started to be realized.