These days I usually make a smoothie for a quick breakfast... perhaps some unsweetened almond milk, protein/vitamin powder, ground flax seed, a bit of fruit/veggies, sometimes even a healthy oil. The concept is not terribly different than soylent.
I do like to keep my blood sugar in a moderate range, however. I might be interested in trying soylent if they had a low-carb version, one not significantly made of oats and maltodextrin.