[1] http://ib.bioninja.com.au/options/option-c-ecology-and-conse...
[1] http://ib.bioninja.com.au/options/option-c-ecology-and-conse...
Also, should add ... I think most people don't care that much about the nutritional value of fake meat. A lot of fast-food meat is already processed and crap.
Anyone who can make something that's 'not steak' simply taste like 'steak' will do really well - it's going to be a cost consideration before anything. Consider the 'meat' in Taco Bell is 75% 'filler/chickenfeed' already.
I think huge chunks of people wouldn't mind eating vegan so long as they could eat stuff that tasted like meat, even if there were some extra processing.
That's why I think it will be a fast-food chain that will make it mainstream: they are cost conscious (as their consumers are), they have the reach and marketing power to change consumer behaviour, and their consumers don't have high-nutritional 'real food' expectations.
So a 'McNotBeef' would do really really well even among regular folks, even traditional meat eaters.
Depending on your animal welfare ethics, I'm not sure that's the best metric to optimise for. To get a good ratio, the animals' movement needs to be restricted and they need to be killed young. Hence, battery hens do very well.