I agree that polls should be getting better not worse, but 2016 did have a lot more undecided voters, especially compared to an election like 2012 where everyone basically had their mind made up already. On August 12th, 2016 the polls had Hillary beating Trump 45% to 38%, so 17% of voters were undecided or voting third party. Even on election night the number was still 12%. Compare that to this year where there's less than 9% third party/undecided voters at the moment.
Trump won largely because he got all the Gary Johnson defects at the very last second, there's no similar big block of voters to count on this year in the same way.
I agree that polls should be getting better not worse, but 2016 did have a lot more undecided voters, especially compared to an election like 2012 where everyone basically had their mind made up already. On August 12th, 2016 the polls had Hillary beating Trump 45% to 38%, so 17% of voters were undecided or voting third party. Even on election night the number was still 12%. Compare that to this year where there's less than 9% third party/undecided voters at the moment.
Trump won largely because he got all the Gary Johnson defects at the very last second, there's no similar big block of voters to count on this year in the same way.