There are other alternatives which can replace factory farming and render lab-grown meat not as worthwhile of a focus.
Perhaps the best alternative to factory farming and feed lots is grass fed beef and free range chickens. Cattle are best adapted to graze and corn and other feeds used to fatten them up are not good for them or for us. mayoclinic.org Buffalo native to the Great Plains is even better.
More traditional forms of agriculture take up substantially more land, time and thus raise costs and potentially increase environmental damage.