Voters associate polls with the media because that is where they hear about them. I believe that the media has so beaten up Republicans, so consistently ripped the party and its nominee, that a substantial portion of them simply will not take a poll over the phone as one form of rebellion against the media.
I offer as proof the polls since the media coverage went negative on Hillary after the James Comey announcement of a reopened investigation. Hillary dropped fourteen points in five days in the ABC poll, which the pollsters there described as a result of willingness to take polls on the phone.
As you can see from the chart to the right, the shift was dramatic. On Fox News Friday morning, Martha MacCallum described an explanation of this offered by the ABC/WaPo pollster. According to MacCallum, they described this as a result of the willingness, or lack thereof, of the two candidates' supporters to take polls. Because Hillary so rarely gets negative coverage in the mainstream liberal media, when she received major negative coverage it had a dramatic impact on the willingness of Democrats to answer pollsters.
I think this explanation makes sense, but it applies to the GOP as well. Most Trump supporters experience hostile treatment from the media every day. I think the particularly harsh and one-sided abuse the media has heaped onto the GOP and its nominee has undermined the preponderance of polls approach. That is why the Crystal Ball is likely to be wrong this time. These new polls represent the actual mean, not a variation from it. Americans don't want Hillary. They want change.