From your first link, the only study that attempted to show a causal link between gluten and schizophrenia had no control group, no placebo, and n=2. This isn't a study, it's a guess.
There may well be something to this whole thing, but the science just isn't there right now, at all. Right now what we need are studies, not solutions. The evidence is non-existent.
http://evolutionarypsychiatry.blogspot.com/2013/11/gluten-an...
There is also rising evidence that gut flora correlate with various mental health issues.
http://www.apa.org/monitor/2012/09/gut-feeling.aspx
http://www.scientificamerican.com/article/gut-bacteria-may-e...