I think that population is shrinking, not growing. They're surely vocal, though.

But if lab grown meat is cheaper, some part of the population would buy it. The farms would lose part of their business so economy of scale would help lab grown meat and hurt the farms. I think it would lead to a feedback loop where lab grown meat will get even cheaper and farm meat would get more expensive.

With lab grown meat you also have the option not only for a perfect piece of meat, but for different kinds of tastes, textures and compositions that haven't existed before. Just like people eat processed meat (think ham or nuggets or deep fried pieces), they would love to try the new tastes. I know I would.