Indeed I very much agree.The number of cattle will decrease until they become either used solely for dairy, or until they become "wild" animals and just roam around doing their thing being animals, whilst (non-human) predators hunt them.
We don't need to eat meat, but we are designed to be able to. So people have a choice. However it is easier to get your nutrition with meat and fish than without - however the "good" vegetarians learn a lot about their diet and exploit/maximise the limits of their food choices.
When you start to get to Veganism is when it really starts to task your creativity for creating food with lots of nutrition.
Maybe it's because I'm a glutton, lazy, or rich enough to be able to afford it, but I wouldn't be happy to forego meat every day. I don't mind the odd day of meat-free eating, but couldn't do it for life. I also enjoy my fish far too much. Also I'm a bit of a nutrition bore, and enjoy giving my body the nutrition it needs, which means that whilst it would be more difficult (effort wise) as a vegetarian I could do it - but I wouldn't enjoy it as much.
While it does require more effort for veganism (not that much for vegetarianism) it's entirely possible to eat a healthy & balanced diet as a meat eater, vegetarian or vegan.
It's a matter of balancing your requirements & making up for deficiencies which result from a potential diet, be that b12 for vegans, iron for some vegetarian diets or fibre for many meat eaters.