If this in fact the case, should Monsanto, DuPonte, and others simply throw their hands in the air and give up? Science progresses at it learns. Same as it ever was. The answer to this issue will, most likely, be solved by Monsanto.
Should the pharmaceutical companies (you know, Big Pharma) give up the search for new antibiotics simply because a particular bug has become resistant to a class of drugs?
Monsanto has a huge investment that is cratering. They need to get ahead of the problem, but they are too late for this planting season. New products take time to develop, test and deploy. Will they have a product reasy for next season?