we would need 50% of the agricultural area compared to now. And if everyone became vegan, we would only need about 25-30%

Yes, that is true. That isn't what I am talking about.

I am talking about what is currently being produced right now. My gut tells me if everyone literally went vegan tomorrow, there wouldn't be enough food to go around.

Reducing meat consumption does need to happen, but it will realistically take at least a few years, if not a decade to transition food supply chains. At minimum, it will take at least a few growing seasons to transition from animal feed crops to food crops.