Personally, I'd love it if rationing for meat and dairy were introduced, but that's because it wouldn't interfere much with the way I already eat, so I guess I'm biased.
What is clear from this thread is that people wouldn't give up meat completely left to their own devices and that's totally understandable.
However, I think most people accept that we can't carry on as we are.
On that basis would people really put their money where their mouths are and radically change their habits? I don't actually think most people would, despite being faced with the evidence that our lifestyle / habits are screwing with the planet. I just wonder if short term pain for us now might prevent our children and grandchildren being faced with a shit storm to sort out. I'd be willingly to try it.