The unreliability of polls is acknowledged by more people with each passing day. A case in point is a Chicago Tribune article by Art and Art History Professor, Eddie Chambers. Here are a few of his comments:
“What we witnessed on the night of the [2016 presidential] election was a lesson in the unreliability of polls“,
“the media seemed . . . intent on peddling the quack science of polling”
For more information about the extent of the acknowledgement of the unreliability of polls, see my book, The Problem with Survey Research.