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Another point to consider is that efforts to make beef production more efficient aren't likely to make the beef healthier, or the process more comfortable for the cows.
For example, reducing the space used by cows increases their stress. Also, it seems that giving cattle growth hormones so that they fatten up faster does not make the meat more delicious or healthier.
If we were to start eating lower on the food chain, then we could depend on insects for much of our protein, and, moreover, eat the grains we currently grow for cows. As the world's population increases, we will need to find a sustainable way to feed everyone. The lowly insect may just lead us to a better future.