> Are we all going to be paranoid schizophrenics?

Paranoid, maybe. Schizophrenics? No. Firstly, "paranoid schizophrenia" is an outdated diagnosis. Paranoia is a common symptom of schizophrenia, but schizophrenics exhibiting paranoia are not considered to have separate mental illness from those who are not. Secondly, schizophrenia is not caused simply by psychological stress, and is associated with a large cluster of positive and negative symptoms, with paranoia being only one of them.