>> can't really be used for much else
I think the question there is, by whom/what? This issue also comes up in the podcast. In some circumstances, grazing properly done can increase biodiversity of an area. The flip side is, again, massive habitat destruction (deforestation in South America) to make forest into pasture. That's neither good for the carbon cycle or biodiversity.
In other words, grazing traditional grasslands appears as though it can be done in ways that sequester carbon and increase biodiversity. Feedlots and grazing on what should be forest or some other habitat is, on the other hand a big issue.
>>price
Ya, that's the problem. Most of the negative impacts of beef are driven by the push to make it cheap and plentiful. To tie into that other thread, I think the sustainable version of beef consumption in the future will be that all the cheap, factory meat currently being produced by cattle, gets produced by fermentation factories etc without the intermediate step of an animal. And a small amount of high-quality, pasture-raised beef will be around as a luxury item for special occasions.
A price on carbon would even out some, maybe all, of the cost differences between factory beef and pasture beef.