Interesting tidbit from Nate (possible good news)

[regnaD kciN]

9. If it turns out as we fear, the fault won't lie with Nate or any of the other correlating sites...

They deserve fault for 2016, because they took what was a close race with polling going in different directions, and put together the big picture wrong.

This time, the issue would be that the polls were quite clear-cut and virtually all in agreement, and all would have had to turned out to be drastically wrong.

If 45 wins again, the ones needing to take a long, hard look at themselves are the polling organizations, who seem to have all been off-base. If the raw data you're given is wrong, then it doesn't matter how you combine it.