National polls have always been meaningless. Local polls only ones that matter. State by state for presidential polls.
More like polls we dislike are meaningless and polls we like are accurate. The only poll that matters happens on November 3rd.
The national presidential vote is, as you say, meaningless. Clinton proved that with her lopsided tallies in California and New York. Set aside the popular vote in California alone, and Trump won the other 49 states.