It cannot happen overnight, but it could happen in a few years. Already now for each gram of beef for example, you have to grow 8-10 grams of maize or feed corn

It cannot happen overnight, but it could happen in a few years. Already now for each gram of beef for example, you have to grow 8-10 grams of maize or feed corn to raise the animal. (Almost no animals are gras fed.) The same area used to grow that maize could be used to grow plants for humans directly instead of "refining" the plants into meat/beef/dairy as it is sometimes called. Processes have to be adapted,for sure and that will take time. But that is not, I think, the limiting factor at the moment. The limiting factor is our appetite for animals.