I love eating beef and whatnot, but my body seems to respond better to eating less of that in a given sitting. As someone growing up in the 80s, it seemed like that diet should be a 50/50 mix of beef and spinach...
I think they are going to have a hard time convincing people to feel crummier... it's much healthier and cheaper to stick to that old "pack of playing card portion"
As a vegetarian for decades, it's also cheaper, often healthier, and isn't difficult at all once you find some new recipes you like. You also don't need to switch all at once. Ease into it by cooking one vegetarian meal a week and then increase it as you find ones you like.
We need to greatly reduce meat consumption in order to make our planet sustainable for human life. You can start at your own pace, but it's easier than ever with all of the meat alternatives these days.