Look if you thought the polling bias in the previous election always determined the next one, you would've thought Hillary was in for a big landslide because dems were systematically underestimated in 2012 including in florida. Obviously it did not go the same way. It's not limited to 2012 either
Pollster make adjustments every cycle. In this case, many have made some quite large ones. How much that effects the results isn't fully knowable until only after the election happens
That's not how your earlier comments are phrased. The earlier comments declare that this is a given structural bias and that it will always exist. How is entirely ignoring the 2012 election any more real than saying we can't be sure?