Probably the most realistic in terms of the cause of the pardigm shift. NASA has come out with a report warning of this possibility. Nothing "tin foil" about that.
And one can not argue about the effect of a massive solar storm and EMP's and the result this would have on our multitude of gadgets. And let's be real. 98% of folks would be completely unprepared for this.
Gage for yourself the psychological effect of this on the general populace.