So far GMOs are practically irrelevant for feeding humans, assuming a vegan diet there is enough land to feed everyone to avoid starvation. If we assume a reasonable amount of meat consumption there is also enough land for that.

I don't know why GMO advocates throw the "but everyone will starve if you don't buy my proprietary products" slogan around as if that makes them look less manipulative. It is supposed to delude people and prevent them from thinking for themselves.