Once more nutritious than natural, the artificial meat will allow to overcome the current energy limitation on our brain.
Once artificial meat becomes mainstream and eating natural meat become obsolete, the human race will be able to overcome obsolete concepts wrt. human/animal intelligence, which will have profound effect on social ethic and intelligence (the share of human civilization resources going into issues of violence, enforcement (of bad rules onto good people and good rules onto bad people), wars, etc... is staggering - more than half), and, in particular, as a side effect, will open our mentality to outside contact as well.