The answer is bison
But to the problem of converting to veganism on a larger scale, I think you’d just gradually phase out by banning further breeding and the cow population could dwindle down. It wouldn’t solve a lot of the other adjacent problems though.
How is it a weakness? If anything it seems like it would help address inequity in how people are treated based on race, age, gender if people are interacting more anonymously, and maybe we could also dispense with this whole coworkers are a family bs that is meant to instil loyalty to a company that doesn’t care about you and offset a lack of work life balance