A future humane alternative to animal meat (and leather) may be petri-dish meat. Theoretically all the benefits of meat, without the slaughtering. But perhaps there's a sort of shortcut. Let's say you could easily induce anencephaly or acephaly in cattle embryos. That's probably easier to achieve than a state-of-culinary-art petri-dish meat. If a vegetarian objects eating meat in the grounds of the suffering of the individual animals being killed, that method would ironically make out of veal the most ethical meat. But I suspect most vegetarians, and perhaps, even non-vegetarians (among them some/most who would essentially agree with the ideal of minimizing harm on animals, with whatever rationalization to not being vegetarians themselves), would then object bringing the "playing god" argument.