Lab grown meat would be a real game changer I think. I would gladly be as early of an adopter of it as possible - and I very rarely adopt anything early on.
Lab grown meat would leave me no real excuse to support the animal farming industry because I would be able to keep everything I love about it and get rid of the stuff I don't. I could have my meat and eat it too.
Edit: This sounded more phallic than intended, going to leave it in though haha.