But many, many people (esp vegans) argue the opposite. The FDA, after years of avoiding an opinion, finally settled on 34-56g/day RDA for protein.
One thing you won't see is any IFBB pros or ANYONE with muscles drinking soylent...
Here's a good URL to read with lots of science. http://examine.com/faq/how-much-protein-do-i-need-every-day....
soylent should be sorta like those the soda machines at the fast food places, cept instead of mixing dr pepper and coke, you could get an extra dose of chicken squirt instead of soy squeeze