Just because that land is there doesn't mean we need to have cows on it though. Also don't forget that the methane porduced by cow herds also contributes to climate change.

If we don't raise cows on land that could sustain crops or use that land to produce animal feed, that would necessarily mean there will be less meat to eat. We would in fact need to reduce our meat consumption to account for this. Surely you can see you're contradicting yourself by saying we don't neede to eat less meat but also shouldn't use feed-lots?