MRPs are great as a cheap and convenient way for someone to "skip" a "real" meal, but I would probably never stop eating solid food overall. I wouldn't say MRPs taste amazing, but they're not bad, and the convenience is well worth the investment, especially considering the price.
As far as the "future of food" is concerned, it definitely has a place in it, however niche it may be, MRPs are here to stay.
On another note, I disagree with Steve Case mainly because most of the people I believe are afraid of products like Queal and Soylent are only able to see it black and white. Nobody says you have to live off the stuff, and nobody says you can't eat anything else either. It's a pretty silly article that assumes anyone who might have purchased this stuff has subscribed to a life of liquid meals.
Of course, while there ARE people who just live off this stuff alone, I'm not one of them, and I consider myself a light user. To say someone is self-absorbed, while at the same time recommending upmarket chains such as "sweetgreen" isn't really a comparable parallel, especially considering I want to save money versus a thirteen-dollar salad. I'm not bashing sweetgreen, but if I'm drinking Queal, it's because I don't want to spend money.
So people go out and eat food together as a social experience - nothing wrong with that, I can still do that if I want to and I have the money to spend on it. I like going out now and then to a nice restaurant and chatting with my friends over a nice meal, but I'm not going to always be able to afford that. When I'm at home, sure, I could cook some food, or save time and get other things done. It's nowhere near as perishable as most other foods either.
Steve Case has an incredibly short-sighted view on this, and doesn't consider the situations where MRPs succeed over food. Cost, Convenience, Shelf-life, etc. It's there when you need it, but nobody is forcing you to live on it alone.