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I don't think it is possible to change human nature.  Human nature, to me, is our instincts.  We are prone to do certain things, such as eat meat.  Our body is made to eat meat.  We can chose not to eat it, but that doesn't change our human nature.  It is just changing our choices.  We can learn to make different choices.  It is possible for someone to decide that they aren't going to eat meat.  
Our choices will continue to change and I think that that is okay.  There is no way of stopping it, so we pretty much have to be okay with it.  I'm not totally into the grown meat idea, but with enough propaganda I'm sure I could be.  However, we would always have the internal desire to hunt and gather and eat meat.  So, the choice is always there to go back to.