It’s impossible to say. Some countries will find it to their advantage to import food, some to export it. The nature of comparative advantage alone is so potentially complex that no smart person would hope to guess how things would work out, and of course any number of factors could change what can be produced where; emerging economies, global climate change, new technologies, trends in what foods are desired, and so on. What is for sure is that food would probably be more plentiful and cheaper.