"All the polls"? Really? I know some Trump supporters like to ignore polls especially when they have a message the President or his supporters don't like, but were "all" the polls leading up to last year's election really wrong and worth ignoring? Let's look at some evidence and data. Clinton won the popular vote by 2.1%. Most polls I saw a week or so before the election had Clinton up by 3% to 4% or so with a Margin of Error of 2.5 to 3.5 (See RCP data linked below). So the average RCP polls were, in fact, more or less within the margin of error. "All the polls" certainly did not indicate Hillary would win by a landslide and in fact, the IBD/TIPP Tracking had Trump winning. 3 of the polls identified below had Clinton up by 2 or 3 which was her popular vote margin of victory. The overall RCP average had Hillary winning by 3.3 and she actually won by 2.1 almost assuredly within the average margin of error.
The problem here, of course, is being right on the popular vote doesn't really matter if the electoral college goes the other way. I'll be curious to see if the pollsters starts summarizing polling data differently in 2020 to show electoral in addition to popular voting results. I suspect that would be pretty difficult though.
https://realclearpolitics.com/epolls/2016/president/us/general_election_trump_vs_clinton_vs_johnson_vs_stein-5952.html
All that polling data is technically true, but the aggregate overview of it as compiled by the Left's "Great One"....Nate Silver...concluded that Trump had a 5% chance of winning the electoral college based on that data. A 95% certainty that Hillary Clinton was our next President...based purely on the data YOU are citing. So while you are right in listing the base polling data, you are entirely wrong in your assessment of how statistical guru's across the political spectrum interpreted that data. A mistake they are almost certain to repeat in 2020...and as they look forward even now at the 2020 contest.
Put plainly, there was a broad and vast consensus that Trump was going to get annihilated in the Electoral College, and that Clinton's 4% win in raw polling equated to an almost certain electoral landslide.
More importantly, you're using this new data....82% of Trump's voters still favoring him...as a negative. Its really not. Have you compared it to similar polling of past GOP presidents at this stage of their time in office? Because that is the ONLY informative comparison with such data...so until you've done that, what your looking at is entirely meaningless as it lacks any context whatsoever. Further, Trump voters are NOTORIOUS for not being honest with pollsters...as well as demonstrating an avoidance of being polled. So polls on his approval, ongoing support, and future support are extremely difficult to gage for accuracy.
I'm not saying to ignore polling BTW. Quite the opposite. And there may be some signs of trouble in recent polling, but none of the arguments made in this thread or that I've seen recently in the media, deviate much from the kind of failed analysis that occurred prior to the 2016 election.
Lets be clear here, what almost gave the election to Hillary...and what, if he were to lose, would give the election to a Dem in 2020....is the idiots on the right who'd rather sit out an election, vote for some Alt-right 3rd party moron, or who simply lack the sense of their own convictions. You know, the moral narcissists.
So, Concerned, if you are going to use data....and I'm a huge fan of doing so...put it in context. And if you want to look at the 2016 polling data in context you must start and end with Nate Silver's analysis...and yes, he was viewed by the data geeks on BOTH sides of the aisle as THE pre-eminent authority on electoral forecasting. In summary, yes, the consensus of the polling gurus was that Hillary would win in an electoral landslide. That's just not a debateable point, as you can go back and quote endlessly from them in the latter days of the election. Hell, the Exit Polling data showed a landslide, which is why nearly all the network anchors and dimwits like the Young Turks were having Hillary-gasms all day right up until 5-6 PM.