People don't seem to understand that Trump has no turnout game, which as a Republican means almost no chance. Look for an Iowa Caucus repeat.
Turnout game matters a lot less in the general than for caucuses, for obvious reasons, though it could matter on the margins.
Though there are a lot of things generally relating to the likely/registered voter distinction (ground game, the Latino vote, the undecideds, Johnson, etc.) that I'm not confident the polls will ever have a good handle on, and could prove to be a surprise in November.
In my experience, a good ground game can make about a 5% difference if operated in a vacuum, which HRC's will probably be.