Well they can start planting now. I think the main possible issue with switching is if the current producers are producing enough for their current market. Like, the Americas produce corn for their consumption but we don't know if they'll have enough excess to sell if the people feeding on wheat switches to corn suddenly.
Wheat is planted in winter and it gets ready in summer. Wheat is not a winter crop.
How ever I dont think this would happen. There will be shortage - this is just a panic created. I am sure that this food crisis will not happen. Ameen
Indeed it wont happen. World can wait for "wheat supplies to recover" and parallel limit himself of some goods or food. What is food crisis - time when there is nothing to eat. So far I dont see that we dont have real problem with food supplies all around the world. Like the world faced travelling problem due to covid and was patiently waiting for it to over, the same will be with wheat supplies. Wait 1-2 years and everything will be back to normal. The world wont starve to death without having few years same wheat amount as usually.