Re: I like the idea but the naming...
I'd really want some third party body to go "yeah we know our stuff... this is a balanced diet and good long term" or something.
They effectively already have that, since they should be working to the RDAs defined by national or trans-national nutritional and food-packaging regulations. I don't know about Soylent specifically, but the nutritional information on the back of a pack of Joylent says that each package contains 100% of the RDA of just about everything.
Long-term is pretty much always a question for anything, but unless you want a 50-year lead time on any new foodstuff, I suppose "it doesn't immediately kill you" is about as good as we can get.
Biting the hand that feeds IT
