too many variables to figure out.
depends on those, epigentic factors and genetic factors as well. too complicated.
they will never solve schizophrenia, or much more (as currently understood) alzheimers unless they utilize a combination of many different drugs catered to the individual (meaning different formulas for everyone), or use a completely different strategy for early detection, or a different approach altogether to the diseases.
will never happen, and there's not enough time left anyway.