Food shock =~ meat shock. 95% of our agriculture is dedicated to raising meat. Cutting meat production immediately relieves any and all water problems.
That's a really tall claim, and I don't believe we don't dedicate resources to grow wheat, rice, corn etc. Do you have sources for that?
Yes, there is and should be a concern. The problem with predictions like this - e.g., "We need GMOs..." - is they presume we'll continue to be completely stupid. Yes, change is difficult. But it's not impossible.