I haven't really pay attention to the Presidential final polls in the last few election but I clearly remember the 2000 Bush/Gore election.
MSNBC had Gore/Bush 50/50
CBS Bush/Gore 51/49
ABC Bush/Gore 51/49
This was when we didn't have all these insane polls we have now and we could say in 2000 it was pretty accurate in what the American people were thinking. I mean the Presidency was separated by a mere 1734 votes in Florida.
If Hillary has a 4-5 point poll lead on election day, there is no way Trump is going to win.