People do not like to eat variety of rice or wheat etc directly. For example, you could have bought short grain, medium grain and long grain rice say 15 years ago. Now, you can only buy long grain in the local store. It is the Wal-Mart effect where Wal-Mart only stores what is bought at the top of the list and drops the product that comes in second or third. So, the variety gets smaller and smaller. One solution is that, use the variety to blend or otherwise produce final products. Such as use different Mangos to make the juice. Or use various grains to extract protein. That way we can maintain the diversity. But who is going to promote this?