We would need to expand the cropland growing food for humans, yes. But there is a lot of cropland currently growing types of corn and hay that we as humans canāt eat, just so we can feed animals and get a less than 20% return on calories from the āfoodā we get when we eat animal muscle and organs.
Which is why our total crop land use would go down if we didnāt eat animals: we need less space to grow calories and nutrients for us that we do to feed the animals we eat. So much gets wasted with the current process that it is unsustainable, and we need to start shifting this now to avoid running into severe land and water deficiencies with the changing climate.
The fact that you also posted this to Lemmyshitpost is telling.