Soylent appeals to exactly those people. If we wanted to live like this we'd just buy a bag of rice and a box of vitamins. We all understand that it's technically possible to use soylent, just that like replacing all your friends with Facebook, or riding a segway, it's social suicide.
or, and hold on, not everyone lives with other people (like, say, students etc) and cooking a meal just for yourself is time consuming and requires you have the energy to do so.
That says nothing about your social life whatever, but, replacing friends on with facebook does. Soylent is in no way social suicide. Even if I wanted to replace my diet 100% with Soylent, that'd have little implication on my already thriving social life, because, you know, I don't only socialize over dinner, there are actual other things to do...
Unless your social life is at a deeper level than simply putting food in your mouth around certain people. Either way, I don't think many people would _replace_ food with Soylent so much as they would drink it instead of eating some meals. I'd love to just drink a glass of liquid instead of preparing and eating a lunch.