Im pretty price driven so for me it wouldn't take that much. If meat went much past the $10/lb range I would eat a lot less of it. At the current price of chicken that would mean 5-10X price increase.

If prices were to stay the same then its a much bigger hurdle. I would need to learn more easy/med difficulty meal recipes and change the my taste pallet. I don't think vegetarian meat substitutes are something I want to put in my body (Vegie dogs/burgers/tofurky) therefore I'd be looking for recipes for foods that have always been vegetarian and can be made outside a lab. If i knew more recipes that I like, were easy to cook, and were filling without loading up on carbs I think that would go a long way. It would help if someone wrote a cook book of Of this quality and covered techniques and science of vegetarian cooking.

Better availability would also help. Fresh veggies are really expensive at the supermarket , I know that they can be about 3x as cheap because that's what my local ethnic food shop sells them for but its kind of far away and is inconvenient to get to. Veggies are also very seasonal so when they are ripe I eat a lot but most of the year ripe vegetables are impossible to obtain. Interestingly enough even in peak season I often still cant get ripe vegetables at the grocery store. I have to either go to the Health food store or farmers market because having a local supply chain is too much work for chain grocery stores.