NASA has been looking into making meat in a lab. A recently published academic paper proves thatchicken nuggets no longer need to be attached to those clucking chickens. In addition to the obvious life-saving benefits, manufactured meat would allow the manufacture to control how much nutrients are in each slice. For example omega 3, which is a good thing, can replace omega 6, which is not as good for you.
One reason some people are vegetarian is because of the environmental effects of raising livestock for human consumption; lab meat will make environmentally unfriendly farming obsolete.
Sure some vegetarians may have to reexamine if they should/can eat lab-made-meat, but the fact that sentient beings may no longer be killed for human consumption is good.