3D printing is on the rise. You can already pre-order an office 3D printer. I can guarantee that it will be available for a cheap price in at least 100 years. Honestly I think it'll be available in like 20 - 30 years but let's just say 100. We can go another 100 years of meat eating without having too many major complications. Also don't you think it's kinda wrong to not eat meat because it can think but instead eat vegetables. For all we know plants could possibly be able to think. They could just have a different way of doing it. Some scientist believe this to be true. I can't remember the name of the plant. It was some weird plant that closed its leaves whenever it got touched. Scientist would drop from the same height every day. Whenever it hit the ground the leaves would close. Then one day the leaves didn't close. They did it again and they still didn't close. They dropped it from a higher height and the leaves closed. They dropped from a lower height and the leaves closed. When dropped again from the same height as the first time they found that the leaves still didn't close. While this isn't the best evidence for plants being able to think but it gives toy an idea.