Angle, I love the idea of Agora for a lot of reasons, but I'm kind of thinking the exact opposite here, I think people need millions of small arguments conversations in order to change their minds about anything. Most people will respect talking heads as far as it doesn't inconvenience them. When it comes to changing their own habits they turn to people right next to them to figure out what actions they should take. It's why I hate celebrity and tabloid science, why I hate the paywall preventing people from actually reading the damn science, why universal education and critical thinking is so damned important, and why I cringe/get a little nasty when I see academics turn the way of misanthropy, scientism, and elitism.
People like to be told what to think about things that don't concern their careers, and that's mostly fine, but if you have a small population that goes to the watered down pop-sci sensationalist style of reporting science - and I will happily include environmental science as the worst, most hateful offender of the batch right next to psychology - you multiply the bullshit when they start talking to their friends, family, complete strangers with authority. Journalism is not a good way to educate.
Re: Soylent... I'm a little distrustful because of the monoculture to produce it that it might create if we were to start taking the stuff as meals regularly. I also love cooking so it would drive me nuts if the cost of actual food went up because of lack of demand. There's a certain amount of mental stimulation we get from eating that might be bad to cut out, but I can't say for sure how dramatic the effects might be to just eat one thing other than that I know it's a punishment in some prisons. I'm also not a nutritionist, but I lean a little towards thinking that we might not know everything about nutrition yet, and taking it over actual food might be premature and a health risk. When people have been taking it regularly for their whole adult lives, I might consider it if I were in a situation where it would make sense, but I'll pass for right now.