Also:
Its becoming more challenging to conduct polls as response rates decline. The polls performance in the most recent U.S. elections the 2014 midterms and the 2016 presidential primaries was middling. There have also been recent, significant polling errors in democracies elsewhere around the world, such as Israel and the United Kingdom. It may be naive to expect the pinpoint precision we saw in polls of presidential elections from 2000 through 2012
Don't get me wrong. I'm on record as saying that Hillary will win, because I am not so confident that there are millions of people like me that don't answer polls. Maybe there are; maybe there aren't...we will find out soon enough. But, I do think you are painting too simplistic of a picture.